diff --git a/scripts/test_runner.py b/scripts/test_runner.py
index 31ddfff..f1ca8fd 100755
--- a/scripts/test_runner.py
+++ b/scripts/test_runner.py
@@ -35,7 +35,11 @@
         self.simulator_cmd = simulator_cmd
         self.buffer = io.StringIO()
         self.child = None
-        self.termination_strings = ["main returned", "Exception occurred"]
+        self.termination_strings = [
+            "main returned",
+            "Exception occurred",
+            "ReadByte from non existing peripheral"
+        ]
 
     def run(self, timeout=1000):
         """ Run the simulation command and quit the simulation."""
@@ -128,7 +132,11 @@
     ansi_escape = re.compile(r"\x1B(?:[@-Z\\-_]|\[[0-?]*[ -/]*[@-~])")
     output = ansi_escape.sub("", output)
     print(output)
-    failure_strings = ["FAILED", "Exception occurred"]
+    failure_strings = [
+        "FAILED",
+        "Exception occurred",
+        "ReadByte from non existing peripheral"
+    ]
     if any(x in output for x in failure_strings):
         sys.exit(1)
     # Grab the return code from the output string with regex