diff --git a/src/scriptlets/trusted-prune-inbound-object.js b/src/scriptlets/trusted-prune-inbound-object.js
index 304f957e..e610ff61 100644
--- a/src/scriptlets/trusted-prune-inbound-object.js
+++ b/src/scriptlets/trusted-prune-inbound-object.js
@@ -105,6 +105,8 @@ export function trustedPruneInboundObject(source, functionName, propsToRemove, r
 
     const { base, prop } = getPropertyInChain(window, functionName);
     if (!base || !prop || typeof base[prop] !== 'function') {
+        const message = `${functionName} is not a function`;
+        logMessage(source, message);
         return;
     }