diff --git a/src/host/dmr/Slot.cpp b/src/host/dmr/Slot.cpp
index 0b7662b5..263848ed 100644
--- a/src/host/dmr/Slot.cpp
+++ b/src/host/dmr/Slot.cpp
@@ -459,7 +459,7 @@ void Slot::processNetwork(const data::NetData& dmrData)
                 bool unitToUnit = (dmrData.getControl() & network::NET_CTRL_U2U) == network::NET_CTRL_U2U;
                 
                 if (grantDemand) {
-                    if (s_network->disallowUnitToUnit() && unitToUnit) {
+                    if (s_network != nullptr && s_network->disallowUnitToUnit() && unitToUnit) {
                         break;
                     }
 
diff --git a/src/host/dmr/packet/Data.cpp b/src/host/dmr/packet/Data.cpp
index 1f1cbaa5..074e0fb3 100644
--- a/src/host/dmr/packet/Data.cpp
+++ b/src/host/dmr/packet/Data.cpp
@@ -441,7 +441,7 @@ void Data::processNetwork(const data::NetData& dmrData)
         uint32_t srcId = m_netDataHeader.getSrcId();
         uint32_t dstId = m_netDataHeader.getDstId();
 
-        if (m_slot->s_network->disallowUnitToUnit() && !gi) {
+        if (m_slot->s_network != nullptr && m_slot->s_network->disallowUnitToUnit() && !gi) {
             LogWarning(LOG_NET, "DMR Slot %u, rejecting network individual data call, srcId = %u, dstId = %u",
                 m_slot->m_slotNo, srcId, dstId);
             return;
diff --git a/src/host/dmr/packet/Voice.cpp b/src/host/dmr/packet/Voice.cpp
index e218ef94..bb5ae3c9 100644
--- a/src/host/dmr/packet/Voice.cpp
+++ b/src/host/dmr/packet/Voice.cpp
@@ -781,7 +781,7 @@ void Voice::processNetwork(const data::NetData& dmrData)
         uint32_t dstId = lc->getDstId();
         FLCO::E flco = lc->getFLCO();
 
-        if (m_slot->s_network->disallowUnitToUnit() && flco == FLCO::PRIVATE) {
+        if (m_slot->s_network != nullptr && m_slot->s_network->disallowUnitToUnit() && flco == FLCO::PRIVATE) {
             LogWarning(LOG_NET, "DMR Slot %u, rejecting network unit-to-unit voice call, srcId = %u, dstId = %u",
                 m_slot->m_slotNo, srcId, dstId);
             return;
@@ -877,7 +877,7 @@ void Voice::processNetwork(const data::NetData& dmrData)
         if (m_slot->m_netState != RS_NET_AUDIO) {
             std::unique_ptr<lc::LC> lc = std::make_unique<lc::LC>(dmrData.getFLCO(), dmrData.getSrcId(), dmrData.getDstId());
 
-            if (m_slot->s_network->disallowUnitToUnit() && lc->getFLCO() == FLCO::PRIVATE) {
+            if (m_slot->s_network != nullptr && m_slot->s_network->disallowUnitToUnit() && lc->getFLCO() == FLCO::PRIVATE) {
                 return;
             }
 
@@ -988,7 +988,7 @@ void Voice::processNetwork(const data::NetData& dmrData)
         if (m_slot->m_netState == RS_NET_IDLE) {
             std::unique_ptr<lc::LC> lc = std::make_unique<lc::LC>(dmrData.getFLCO(), dmrData.getSrcId(), dmrData.getDstId());
 
-            if (m_slot->s_network->disallowUnitToUnit() && lc->getFLCO() == FLCO::PRIVATE) {
+            if (m_slot->s_network != nullptr && m_slot->s_network->disallowUnitToUnit() && lc->getFLCO() == FLCO::PRIVATE) {
                 return;
             }
 
diff --git a/src/host/nxdn/packet/ControlSignaling.cpp b/src/host/nxdn/packet/ControlSignaling.cpp
index 60e799a3..8f0a8e24 100644
--- a/src/host/nxdn/packet/ControlSignaling.cpp
+++ b/src/host/nxdn/packet/ControlSignaling.cpp
@@ -289,7 +289,7 @@ bool ControlSignaling::processNetwork(FuncChannelType::E fct, ChOption::E option
         uint16_t srcId = rcch->getSrcId();
         uint16_t dstId = rcch->getDstId();
 
-        if (m_nxdn->m_network->disallowUnitToUnit()) {
+        if (m_nxdn->m_network != nullptr && m_nxdn->m_network->disallowUnitToUnit()) {
             switch (rcch->getMessageType()) {
             case MessageType::RTCH_VCALL:
                 if (!rcch->getGroup()) {
diff --git a/src/host/nxdn/packet/Data.cpp b/src/host/nxdn/packet/Data.cpp
index 0863d8b7..41d3d55c 100644
--- a/src/host/nxdn/packet/Data.cpp
+++ b/src/host/nxdn/packet/Data.cpp
@@ -240,7 +240,7 @@ bool Data::processNetwork(ChOption::E option, lc::RTCH& netLC, uint8_t* data, ui
     uint16_t srcId = lc.getSrcId();
     bool group = lc.getGroup();
 
-    if (m_nxdn->m_network->disallowUnitToUnit() && !group) {
+    if (m_nxdn->m_network != nullptr && m_nxdn->m_network->disallowUnitToUnit() && !group) {
         LogWarning(LOG_NET, "NXDN, rejecting network individual data call, srcId = %u, dstId = %u",
             srcId, dstId);
         return false;
diff --git a/src/host/nxdn/packet/Voice.cpp b/src/host/nxdn/packet/Voice.cpp
index 0c9be650..f840ae8a 100644
--- a/src/host/nxdn/packet/Voice.cpp
+++ b/src/host/nxdn/packet/Voice.cpp
@@ -694,7 +694,7 @@ bool Voice::processNetwork(FuncChannelType::E fct, ChOption::E option, lc::RTCH&
         bool group = lc.getGroup();
         bool encrypted = lc.getEncrypted();
 
-        if (m_nxdn->m_network->disallowUnitToUnit() && !group) {
+        if (m_nxdn->m_network != nullptr && m_nxdn->m_network->disallowUnitToUnit() && !group) {
             LogWarning(LOG_NET, "NXDN, rejecting network unit-to-unit voice call, srcId = %u, dstId = %u",
                 srcId, dstId);
             return false;
diff --git a/src/host/p25/Control.cpp b/src/host/p25/Control.cpp
index 0b26eefc..9aee0a37 100644
--- a/src/host/p25/Control.cpp
+++ b/src/host/p25/Control.cpp
@@ -1635,7 +1635,7 @@ void Control::processNetwork()
     control.setNetId(netId);
     control.setSysId(sysId);
 
-    if (m_network->disallowUnitToUnit()) {
+    if (m_network != nullptr && m_network->disallowUnitToUnit()) {
         const bool privateCall = lco == LCO::PRIVATE || lco == LCO::PRIVATE_EXT;
         const bool voiceFrame = duid == DUID::HDU || duid == DUID::LDU1 || duid == DUID::LDU2;
         const bool callEnd = duid == DUID::TDU || duid == DUID::TDULC;
diff --git a/src/host/p25/packet/ControlSignaling.cpp b/src/host/p25/packet/ControlSignaling.cpp
index 9c45d1a8..8f74a242 100644
--- a/src/host/p25/packet/ControlSignaling.cpp
+++ b/src/host/p25/packet/ControlSignaling.cpp
@@ -872,7 +872,7 @@ bool ControlSignaling::processNetwork(uint8_t* data, uint32_t len, lc::LC& contr
                     return false;
                 }
 
-                if (m_p25->m_network->disallowUnitToUnit()) {
+                if (m_p25->m_network != nullptr && m_p25->m_network->disallowUnitToUnit()) {
                     switch (tsbk->getLCO()) {
                     case TSBKO::IOSP_UU_VCH:
                     case TSBKO::IOSP_UU_ANS:
@@ -1603,7 +1603,7 @@ void ControlSignaling::writeNetworkRF(lc::TSBK* tsbk, const uint8_t* data, bool
     if (m_p25->m_network == nullptr)
         return;
 
-    if (m_p25->m_network->disallowUnitToUnit()) {
+    if (m_p25->m_network != nullptr && m_p25->m_network->disallowUnitToUnit()) {
         switch (tsbk->getLCO()) {
         case TSBKO::IOSP_UU_VCH:
         case TSBKO::IOSP_UU_ANS:
@@ -1637,7 +1637,8 @@ void ControlSignaling::writeNetworkRF(lc::TDULC* tduLc, const uint8_t* data, boo
     if (m_p25->m_network == nullptr)
         return;
 
-    if (m_p25->m_network->disallowUnitToUnit() && (tduLc->getLCO() == LCO::PRIVATE || tduLc->getLCO() == LCO::PRIVATE_EXT))
+    if (m_p25->m_network != nullptr && m_p25->m_network->disallowUnitToUnit() &&
+        (tduLc->getLCO() == LCO::PRIVATE || tduLc->getLCO() == LCO::PRIVATE_EXT))
         return;
 
     if (m_p25->m_rfTimeoutTimer.isRunning() && m_p25->m_rfTimeoutTimer.hasExpired())
diff --git a/src/host/p25/phase2/Control.cpp b/src/host/p25/phase2/Control.cpp
index 46aa0e89..3f7692dc 100644
--- a/src/host/p25/phase2/Control.cpp
+++ b/src/host/p25/phase2/Control.cpp
@@ -292,7 +292,7 @@ bool Control::writeNetwork(Slot* slot, const uint8_t* data, uint32_t length)
     if (m_network == nullptr || slot == nullptr || data == nullptr)
         return true;
 
-    if (m_network->disallowUnitToUnit() && (slot->m_control.getLCO() == defines::P2_MAC_MCO::PRIVATE || 
+    if (m_network != nullptr && m_network->disallowUnitToUnit() && (slot->m_control.getLCO() == defines::P2_MAC_MCO::PRIVATE ||
         (slot->m_controlByte & network::NET_CTRL_U2U) == network::NET_CTRL_U2U))
         return true;
 
diff --git a/src/host/p25/phase2/Slot.cpp b/src/host/p25/phase2/Slot.cpp
index 73d5b078..ac09df75 100644
--- a/src/host/p25/phase2/Slot.cpp
+++ b/src/host/p25/phase2/Slot.cpp
@@ -444,7 +444,8 @@ bool Slot::processNetwork(uint8_t* data, uint32_t length, const lc::LC& control,
 {
     CHECK_NET_AUTHORITATIVE(control.getDstId());
 
-    if (s_network->disallowUnitToUnit() && isVoiceDUID(duid) && (controlByte & network::NET_CTRL_U2U) == network::NET_CTRL_U2U) {
+    if (s_network != nullptr && s_network->disallowUnitToUnit() && isVoiceDUID(duid) &&
+        (controlByte & network::NET_CTRL_U2U) == network::NET_CTRL_U2U) {
         return false;
     }
 
@@ -1156,7 +1157,7 @@ bool Slot::processMAC(uint8_t* data, uint32_t length, defines::P2_DUID::E duid,
     if (net && !m_control.decodeVCH_MACPDU_OEMI(frame, sync))
         return false;
 
-    if (net && s_network->disallowUnitToUnit() &&
+    if (net && s_network != nullptr && s_network->disallowUnitToUnit() &&
         m_control.getLCO() == defines::P2_MAC_MCO::PRIVATE) {
         LogWarning(LOG_NET, "P25 Phase 2 Slot %u, rejecting network unit-to-unit MAC PDU, srcId = %u, dstId = %u",
             m_slotNo + 1U, m_control.getSrcId(), m_control.getDstId());
diff --git a/tests/dmr/HostControl_Tests.cpp b/tests/dmr/HostControl_Tests.cpp
index c66d5854..04e59374 100644
--- a/tests/dmr/HostControl_Tests.cpp
+++ b/tests/dmr/HostControl_Tests.cpp
@@ -421,6 +421,7 @@ public:
     ~DMRHostHarness()
     {
         delete m_control;
+        HostTestHooks::dmrDetachNetwork();
         delete m_network;
         g_RPC = nullptr;
     }
diff --git a/tests/host/HostTestHooks.cpp b/tests/host/HostTestHooks.cpp
index f4e000d0..22cab11c 100644
--- a/tests/host/HostTestHooks.cpp
+++ b/tests/host/HostTestHooks.cpp
@@ -178,6 +178,13 @@ bool HostTestHooks::dmrStartRFVoiceCall(dmr::Slot& slot, uint32_t srcId, uint32_
     return slot.processFrame(frame, sizeof(frame));
 }
 
+/* Detaches the shared DMR network pointer during test-fixture teardown. */
+
+void HostTestHooks::dmrDetachNetwork()
+{
+    dmr::Slot::s_network = nullptr;
+}
+
 /* Configures a co-located DMR Tier III control channel. */
 
 void HostTestHooks::dmrEnableTier3(dmr::Control& control, uint32_t channelNo, uint8_t tsccSlot)
diff --git a/tests/host/HostTestHooks.h b/tests/host/HostTestHooks.h
index 019071c9..74983e40 100644
--- a/tests/host/HostTestHooks.h
+++ b/tests/host/HostTestHooks.h
@@ -128,6 +128,10 @@ public:
      * @return bool True if frame processing succeeds.
      */
     static bool dmrStartRFVoiceCall(dmr::Slot& slot, uint32_t srcId, uint32_t dstId, bool group = true);
+    /**
+     * @brief Detaches the shared DMR network pointer during test-fixture teardown.
+     */
+    static void dmrDetachNetwork();
     /**
      * @brief Configures one slot as a co-located Tier III control channel for tests.
      */