diff --git a/client/iOS/Models/RDPSession.m b/client/iOS/Models/RDPSession.m
index af400bb61..87a1aafc6 100644
--- a/client/iOS/Models/RDPSession.m
+++ b/client/iOS/Models/RDPSession.m
@@ -190,7 +190,9 @@ NSString* TSXSessionDidFailToConnectNotification = @"TSXSessionDidFailToConnect"
 
 - (CGContextRef)bitmapContext
 {
-	return [self mfi]->bitmap_context;
+    if ([self mfi]->connection_state == TSXConnectionConnected)
+        return [self mfi]->bitmap_context;
+    return NULL;
 }
 
 #pragma mark -
diff --git a/libfreerdp/crypto/der.c b/libfreerdp/crypto/der.c
index 7c4694f17..1cc5eb770 100644
--- a/libfreerdp/crypto/der.c
+++ b/libfreerdp/crypto/der.c
@@ -27,9 +27,9 @@
 
 int _der_skip_length(int length)
 {
-	if (length > 0x81 && length <= 0x102)
+	if (length > 0x7F && length <= 0xFF)
 		return 2;
-	else if (length > 0x102)
+	else if (length > 0xFF)
 		return 3;
 	else
 		return 1;