Only fill out the error if one doesn’t already exist

davedelong · Jan 4, 2014 · b40e3ca · b40e3ca
1 parent 400517b
commit b40e3ca
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/DDMathParser/DDMathEvaluator.m b/DDMathParser/DDMathEvaluator.m
@@ -126,7 +126,7 @@ - (DDExpression *)resolveFunction:(_DDFunctionExpression *)functionExpression va
         e = function([functionExpression arguments], variables, self, error);
     }
 
-	if (e == nil && error != nil) {
+	if (e == nil && error != nil && *error == nil) {
         *error = [NSError errorWithDomain:DDMathParserErrorDomain
                                      code:DDErrorCodeUnresolvedFunction
                                  userInfo:@{NSLocalizedDescriptionKey: [NSString stringWithFormat:@"unable to resolve function: %@", functionName],