closeStream now checks for null to avoid segfaults
diff --git a/tests/testStreamClosedMethods.cpp b/tests/testStreamClosedMethods.cpp
index 3f56d76..b26788f 100644
--- a/tests/testStreamClosedMethods.cpp
+++ b/tests/testStreamClosedMethods.cpp
@@ -43,9 +43,11 @@
     }
 
     void closeStream(){
-        Result r = mStream->close();
-        if (r != Result::OK){
-            FAIL() << "Failed to close stream. " << convertToText(r);
+        if (mStream != nullptr){
+            Result r = mStream->close();
+            if (r != Result::OK){
+                FAIL() << "Failed to close stream. " << convertToText(r);
+            }
         }
     }