diff --git a/hscript/CustomClassHandler.hx b/hscript/CustomClassHandler.hx
index 11b79f8..ff54c73 100644
--- a/hscript/CustomClassHandler.hx
+++ b/hscript/CustomClassHandler.hx
@@ -205,6 +205,7 @@ class CustomClassHandler implements IHScriptCustomConstructor implements IHScrip
 		return _class;
 	}
 
+	@:allow(hscript.Interp)
 	function hasField(name:String) {
         return staticFields.contains(name);
     }
diff --git a/hscript/Interp.hx b/hscript/Interp.hx
index fe59f28..d8667d3 100644
--- a/hscript/Interp.hx
+++ b/hscript/Interp.hx
@@ -1280,6 +1280,13 @@ class Interp {
 		if (o == null)
 			error(EInvalidAccess(f));
 
+		if(o is CustomClass) {
+			if(cast(o, CustomClass).__class.hasField(f)) { 
+				var clsName = cast(o, CustomClass).className;
+				error(ECustom('The field ${clsName}.${f} should be accessed in a static way.'));
+			}
+		}
+
 		var cls = Type.getClass(o);
 		if (useRedirects && {
 			var cl:Null<String> = getClassType(o, cls);
@@ -1320,6 +1327,13 @@ class Interp {
 		if (o == null)
 			error(EInvalidAccess(f));
 
+		if(o is CustomClass) {
+			if(cast(o, CustomClass).__class.hasField(f)) { 
+				var clsName = cast(o, CustomClass).className;
+				error(ECustom('The field ${clsName}.${f} should be accessed in a static way.'));
+			}
+		}
+
 		if (useRedirects && {
 			var cl:Null<String> = getClassType(o);
 			cl != null && setRedirects.exists(cl) && (_setRedirect = setRedirects[cl]) != null;