From 3e094708bfb7e0e27a1d44cbb212a5db9a5eb3a6 Mon Sep 17 00:00:00 2001
From: Mattt <mattt@me.com>
Date: Tue, 10 Jul 2018 14:41:59 -0700
Subject: [PATCH] Fix nullability of forwardInvocation

---
 Source/ONOXMLDocument.m | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Source/ONOXMLDocument.m b/Source/ONOXMLDocument.m
index 82a02c1..70d7e5e 100644
--- a/Source/ONOXMLDocument.m
+++ b/Source/ONOXMLDocument.m
@@ -964,7 +964,10 @@ - (nullable NSMethodSignature *)methodSignatureForSelector:(SEL)selector {
 }
 
 - (void)forwardInvocation:(NSInvocation *)invocation {
-    [invocation invokeWithTarget:[self stringValue]];
+    NSString *stringValue = self.stringValue;
+    if (stringValue) {
+        [invocation invokeWithTarget:stringValue];
+    }
 }
 
 #pragma mark - NSCopying