diff --git a/core/modules/filters/function.js b/core/modules/filters/function.js
index 79210fb78..bc0702cf4 100644
--- a/core/modules/filters/function.js
+++ b/core/modules/filters/function.js
@@ -17,19 +17,24 @@ Export our filter function
 */
 exports.function = function(source,operator,options) {
 	var functionName = operator.operands[0],
-		params = [];
+		params = [],
+		results;
 	$tw.utils.each(operator.operands.slice(1),function(param) {
 		params.push({value: param});
 	});
+	// console.log(`Calling ${functionName} with params ${JSON.stringify(params)}`);
 	var variableInfo = options.widget && options.widget.getVariableInfo && options.widget.getVariableInfo(functionName,{params: params, source: source});
 	if(variableInfo && variableInfo.srcVariable && variableInfo.srcVariable.isFunctionDefinition) {
-		return variableInfo.resultList ? variableInfo.resultList : [variableInfo.text];
+		results = variableInfo.resultList ? variableInfo.resultList : [variableInfo.text];
 	}
 	// Return the input list if the function wasn't found
-	var results = [];
-	source(function(tiddler,title) {
-		results.push(title);
-	});
+	if(!results) {
+		results = [];
+		source(function(tiddler,title) {
+			results.push(title);
+		});	
+	}
+	// console.log(`function ${functionName} with params ${JSON.stringify(params)} results: ${JSON.stringify(results)}`);
 	return results;
 };