diff --git a/Generals/Code/GameEngine/Source/GameLogic/Object/Update/AIUpdate/DozerAIUpdate.cpp b/Generals/Code/GameEngine/Source/GameLogic/Object/Update/AIUpdate/DozerAIUpdate.cpp
index d5371bd9a3..0617dec83c 100644
--- a/Generals/Code/GameEngine/Source/GameLogic/Object/Update/AIUpdate/DozerAIUpdate.cpp
+++ b/Generals/Code/GameEngine/Source/GameLogic/Object/Update/AIUpdate/DozerAIUpdate.cpp
@@ -1599,6 +1599,10 @@ UpdateSleepTime DozerAIUpdate::update( void )
 		if( currentTask == DOZER_TASK_REPAIR &&
 				TheActionManager->canRepairObject( getObject(), targetObject, getLastCommandSource() ) == FALSE )
 			invalidTask = TRUE;
+#if !RETAIL_COMPATIBLE_CRC
+		else if (currentTask == DOZER_TASK_BUILD && targetObject == NULL)
+			invalidTask = TRUE;
+#endif
 
 		// cancel the task if it's now invalid
 		if( invalidTask == TRUE )
diff --git a/Generals/Code/GameEngine/Source/GameLogic/Object/Update/AIUpdate/WorkerAIUpdate.cpp b/Generals/Code/GameEngine/Source/GameLogic/Object/Update/AIUpdate/WorkerAIUpdate.cpp
index 7b2dfd9eec..44d11ad4ad 100644
--- a/Generals/Code/GameEngine/Source/GameLogic/Object/Update/AIUpdate/WorkerAIUpdate.cpp
+++ b/Generals/Code/GameEngine/Source/GameLogic/Object/Update/AIUpdate/WorkerAIUpdate.cpp
@@ -283,6 +283,10 @@ UpdateSleepTime WorkerAIUpdate::update( void )
 			if( currentTask == DOZER_TASK_REPAIR &&
 					TheActionManager->canRepairObject( getObject(), targetObject, getLastCommandSource() ) == FALSE )
 				invalidTask = TRUE;
+#if !RETAIL_COMPATIBLE_CRC
+			else if (currentTask == DOZER_TASK_BUILD && targetObject == NULL)
+				invalidTask = TRUE;
+#endif
 
 			// cancel the task if it's now invalid
 			if( invalidTask == TRUE )
diff --git a/GeneralsMD/Code/GameEngine/Source/GameLogic/Object/Update/AIUpdate/DozerAIUpdate.cpp b/GeneralsMD/Code/GameEngine/Source/GameLogic/Object/Update/AIUpdate/DozerAIUpdate.cpp
index ea9d64c9a2..651202dd6b 100644
--- a/GeneralsMD/Code/GameEngine/Source/GameLogic/Object/Update/AIUpdate/DozerAIUpdate.cpp
+++ b/GeneralsMD/Code/GameEngine/Source/GameLogic/Object/Update/AIUpdate/DozerAIUpdate.cpp
@@ -1604,6 +1604,10 @@ UpdateSleepTime DozerAIUpdate::update( void )
 		if( currentTask == DOZER_TASK_REPAIR &&
 				TheActionManager->canRepairObject( getObject(), targetObject, getLastCommandSource() ) == FALSE )
 			invalidTask = TRUE;
+#if !RETAIL_COMPATIBLE_CRC
+		else if (currentTask == DOZER_TASK_BUILD && targetObject == NULL)
+			invalidTask = TRUE;
+#endif
 
 		// cancel the task if it's now invalid
 		if( invalidTask == TRUE )
diff --git a/GeneralsMD/Code/GameEngine/Source/GameLogic/Object/Update/AIUpdate/WorkerAIUpdate.cpp b/GeneralsMD/Code/GameEngine/Source/GameLogic/Object/Update/AIUpdate/WorkerAIUpdate.cpp
index a3bdd0628a..15e1af6b76 100644
--- a/GeneralsMD/Code/GameEngine/Source/GameLogic/Object/Update/AIUpdate/WorkerAIUpdate.cpp
+++ b/GeneralsMD/Code/GameEngine/Source/GameLogic/Object/Update/AIUpdate/WorkerAIUpdate.cpp
@@ -283,6 +283,10 @@ UpdateSleepTime WorkerAIUpdate::update( void )
 			if( currentTask == DOZER_TASK_REPAIR &&
 					TheActionManager->canRepairObject( getObject(), targetObject, getLastCommandSource() ) == FALSE )
 				invalidTask = TRUE;
+#if !RETAIL_COMPATIBLE_CRC
+			else if (currentTask == DOZER_TASK_BUILD && targetObject == NULL)
+				invalidTask = TRUE;
+#endif
 
 			// cancel the task if it's now invalid
 			if( invalidTask == TRUE )