Fix execution of custom functions

Author: Florian Kroenert

build.fsx

@@ -35,7 +35,7 @@ let sha = Git.Information.getCurrentHash()
 // version info
 let major = "3"
 let minor = "9"
-let patch = "12"
+let patch = "13"
 
 // Follow SemVer scheme: http://semver.org/
 let asmVersion = major + "." + minor + "." + patch

src/lib/Xrm.Oss.XTL.Interpreter/XTLInterpreter.cs

@@ -270,7 +270,7 @@ private ValueExpression ApplyExpression (string name, List<ValueExpression> para
                 if (_interpreterConfig?.CustomHandlers?.ContainsKey(name) ?? false)
                 {
                     _tracing.Trace($"Processing custom handler {name}");
-                    var result = _handlers[name](_primary, _service, _tracing, _interpreterConfig, parameters);
+                    var result = _interpreterConfig.CustomHandlers[name](_primary, _service, _tracing, _interpreterConfig, parameters);
                     _tracing.Trace($"Successfully processed custom handler {name}");
 
                     return result;