Protect CPTLayer against invalid rendering context. Fixed issue core-plot#133.

eskroch · eskroch · commit d0e3aa5e85ce · 2014-11-30T15:58:11.000-05:00
diff --git a/framework/Source/CPTLayer.m b/framework/Source/CPTLayer.m
@@ -305,9 +305,14 @@ -(void)display
 
 -(void)drawInContext:(CGContextRef)context
 {
-    self.useFastRendering = YES;
-    [self renderAsVectorInContext:context];
-    self.useFastRendering = NO;
+    if ( context ) {
+        self.useFastRendering = YES;
+        [self renderAsVectorInContext:context];
+        self.useFastRendering = NO;
+    }
+    else {
+        NSLog(@"%@: Tried to draw into a NULL context", self);
+    }
 }
 
 /// @endcond
