diff --git a/Source/Engine/AI/BehaviorKnowledge.cpp b/Source/Engine/AI/BehaviorKnowledge.cpp
index a73a1cfd4..fce460636 100644
--- a/Source/Engine/AI/BehaviorKnowledge.cpp
+++ b/Source/Engine/AI/BehaviorKnowledge.cpp
@@ -144,7 +144,10 @@ BehaviorKnowledge::~BehaviorKnowledge()
 
 void BehaviorKnowledge::InitMemory(BehaviorTree* tree)
 {
-    ASSERT_LOW_LAYER(!Tree && tree);
+    if (Tree)
+        FreeMemory();
+    if (!tree)
+        return;
     Tree = tree;
     Blackboard = Variant::NewValue(tree->Graph.Root->BlackboardType);
     RelevantNodes.Resize(tree->Graph.NodesCount, false);
diff --git a/Source/Engine/Level/SceneObjectsFactory.cpp b/Source/Engine/Level/SceneObjectsFactory.cpp
index 36681d64b..d9c86d250 100644
--- a/Source/Engine/Level/SceneObjectsFactory.cpp
+++ b/Source/Engine/Level/SceneObjectsFactory.cpp
@@ -445,6 +445,8 @@ void SceneObjectsFactory::SetupPrefabInstances(Context& context, const PrefabSyn
         const SceneObject* obj = data.SceneObjects[i];
         const Guid id = obj ? obj->GetID() : JsonTools::GetGuid(stream, "ID");
         auto prefab = Content::LoadAsync<Prefab>(prefabId);
+        if (!prefab)
+            continue;
 
         // Check if it's parent is in the same prefab
         int32 index;
diff --git a/Source/Engine/Scripting/BinaryModule.cpp b/Source/Engine/Scripting/BinaryModule.cpp
index e9465096f..44ef32503 100644
--- a/Source/Engine/Scripting/BinaryModule.cpp
+++ b/Source/Engine/Scripting/BinaryModule.cpp
@@ -1235,17 +1235,17 @@ bool ManagedBinaryModule::InvokeMethod(void* method, const Variant& instance, Sp
     const bool withInterfaces = !mMethod->IsStatic() && mMethod->GetParentClass()->IsInterface();
     if (!mMethod->IsStatic())
     {
-        // Box instance into C# object
+        // Box instance into C# object (and validate the type)
         MObject* instanceObject = MUtils::BoxVariant(instance);
-        const MClass* instanceObjectClass = MCore::Object::GetClass(instanceObject);
-
-        // Validate instance
-        if (!instanceObject || !instanceObjectClass->IsSubClassOf(mMethod->GetParentClass(), withInterfaces))
+        if (!instanceObject)
         {
-            if (!instanceObject)
-                LOG(Error, "Failed to call method '{0}.{1}' (args count: {2}) without object instance", String(mMethod->GetParentClass()->GetFullName()), String(mMethod->GetName()), parametersCount);
-            else
-                LOG(Error, "Failed to call method '{0}.{1}' (args count: {2}) with invalid object instance of type '{3}'", String(mMethod->GetParentClass()->GetFullName()), String(mMethod->GetName()), parametersCount, String(MUtils::GetClassFullname(instanceObject)));
+            LOG(Error, "Failed to call method '{0}.{1}' (args count: {2}) without object instance", String(mMethod->GetParentClass()->GetFullName()), String(mMethod->GetName()), parametersCount);
+            return true;
+        }
+        const MClass* instanceObjectClass = MCore::Object::GetClass(instanceObject);
+        if (!instanceObjectClass->IsSubClassOf(mMethod->GetParentClass(), withInterfaces))
+        {
+            LOG(Error, "Failed to call method '{0}.{1}' (args count: {2}) with invalid object instance of type '{3}'", String(mMethod->GetParentClass()->GetFullName()), String(mMethod->GetName()), parametersCount, String(MUtils::GetClassFullname(instanceObject)));
             return true;
         }