diff --git a/tests/gui_tests.py b/tests/gui_tests.py
index 4a886f8..3095dbb 100644
--- a/tests/gui_tests.py
+++ b/tests/gui_tests.py
@@ -38,6 +38,8 @@ def test_GIVEN_streaming_dae_perspective_exists_THEN_it_is_set_to_not_shown_on_i
             self.skipTest("Instrument is unavailable")
 
         version = self.ca.get_version_string()
+        if version is None or version == "":
+            self.skipTest("Instrument is unavailable")
 
         version_major = int(version.split(".")[0])
         version_minor = int(version.split(".")[1])