diff --git a/src/main/java/org/apache/commons/jxpath/ri/JXPathContextReferenceImpl.java b/src/main/java/org/apache/commons/jxpath/ri/JXPathContextReferenceImpl.java
index 54dc9d7f5..ebabc8231 100644
--- a/src/main/java/org/apache/commons/jxpath/ri/JXPathContextReferenceImpl.java
+++ b/src/main/java/org/apache/commons/jxpath/ri/JXPathContextReferenceImpl.java
@@ -777,20 +777,9 @@ public NodePointer getVariablePointer(QName name) {
      * @return Function
      */
     public Function getFunction(QName functionName, Object[] parameters) {
-        Function func = null;
-        int hashParameters;
-        if (parameters == null) {
-            hashParameters = 0;
-        }
-        else
-        {
-            List<Object> paramList = Arrays.asList(parameters);
-            List<Class> classList = paramList.stream().map(p -> p.getClass()).collect(Collectors.toList());
-            hashParameters = Arrays.hashCode(classList.toArray());
-        }
-        Integer functionHash = Integer.valueOf(Objects.hash(functionName, hashParameters));
+        Integer functionHash = getFunctionHash(functionName, parameters);
         if (CACHE_ENABLED) {
-            func = functionCache.get(functionHash);
+            Function func = functionCache.get(functionHash);
             if (func != null) {
                 return func;
             }
@@ -803,7 +792,7 @@ public Function getFunction(QName functionName, Object[] parameters) {
         while (funcCtx != null) {
             funcs = funcCtx.getFunctions();
             if (funcs != null) {
-                func = funcs.getFunction(namespace, name, parameters);
+                Function func = funcs.getFunction(namespace, name, parameters);
                 if (func != null) {
                     if (CACHE_ENABLED) {
                         functionCache.put(functionHash, func);
@@ -817,6 +806,27 @@ public Function getFunction(QName functionName, Object[] parameters) {
             "Undefined function: " + functionName.toString());
     }
 
+
+    private static Integer getFunctionHash(QName functionName, Object[] parameters)
+    {
+        if (!CACHE_ENABLED) {
+            return Integer.valueOf(-1);
+        }
+
+        int hashParameters;
+        if (parameters == null) {
+            hashParameters = 0;
+        }
+        else
+        {
+            List<Object> paramList = Arrays.asList(parameters);
+            List<Class> classList = paramList.stream().map(p -> p.getClass()).collect(Collectors.toList());
+            hashParameters = Arrays.hashCode(classList.toArray());
+        }
+        return Integer.valueOf(Objects.hash(functionName, hashParameters));
+    }
+
+
     public void registerNamespace(String prefix, String namespaceURI) {
         if (namespaceResolver.isSealed()) {
             namespaceResolver = (NamespaceResolver) namespaceResolver.clone();