diff --git a/Source/Entities/MovableObject.cpp b/Source/Entities/MovableObject.cpp
index a8190cc418..7bd2a05b5a 100644
--- a/Source/Entities/MovableObject.cpp
+++ b/Source/Entities/MovableObject.cpp
@@ -763,7 +763,11 @@ bool MovableObject::IsAtRest() {
 
 bool MovableObject::OnMOHit(HitData& hd) {
 	if (hd.RootBody[HITOR] != hd.RootBody[HITEE] && (hd.Body[HITOR] == this || hd.Body[HITEE] == this)) {
-		RunScriptedFunctionInAppropriateScripts("OnCollideWithMO", false, false, {hd.Body[hd.Body[HITOR] == this ? HITEE : HITOR], hd.RootBody[hd.Body[HITOR] == this ? HITEE : HITOR]});
+		static const std::string functionName = "OnCollideWithMO";
+		auto function = m_FunctionsAndScripts.find(functionName);
+		if (function != m_FunctionsAndScripts.end() && !function->second.empty()) {
+			RunScriptedFunctionInAppropriateScripts(functionName, false, false, {hd.Body[hd.Body[HITOR] == this ? HITEE : HITOR], hd.RootBody[hd.Body[HITOR] == this ? HITEE : HITOR]});
+		}
 	}
 	return hd.Terminate[hd.RootBody[HITOR] == this ? HITOR : HITEE] = false;
 }
@@ -775,7 +779,11 @@ unsigned char MovableObject::HitWhatTerrMaterial() const {
 void MovableObject::SetHitWhatTerrMaterial(unsigned char matID) {
 	m_TerrainMatHit = matID;
 	m_LastCollisionSimFrameNumber = g_MovableMan.GetSimUpdateFrameNumber();
-	RunScriptedFunctionInAppropriateScripts("OnCollideWithTerrain", false, false, {}, {std::to_string(m_TerrainMatHit)});
+	static const std::string functionName = "OnCollideWithTerrain";
+	auto function = m_FunctionsAndScripts.find(functionName);
+	if (function != m_FunctionsAndScripts.end() && !function->second.empty()) {
+		RunScriptedFunctionInAppropriateScripts(functionName, false, false, {}, {std::to_string(m_TerrainMatHit)});
+	}
 }
 
 Vector MovableObject::GetTotalForce() {