diff --git a/tools/wptrunner/wptrunner/browsers/firefox_android.py b/tools/wptrunner/wptrunner/browsers/firefox_android.py
index e52f980c529cc4..4df33b1f517f53 100644
--- a/tools/wptrunner/wptrunner/browsers/firefox_android.py
+++ b/tools/wptrunner/wptrunner/browsers/firefox_android.py
@@ -137,7 +137,10 @@ def get_environ(chaos_mode_flags, env_extras=None):
     env = {}
     if env_extras is not None:
         env.update(env_extras)
-    env["MINIDUMP_SAVE_PATH"] = os.environ["MINIDUMP_SAVE_PATH"]
+
+    if "MINIDUMP_SAVE_PATH" in os.environ:
+        env["MINIDUMP_SAVE_PATH"] = os.environ["MINIDUMP_SAVE_PATH"]
+
     env["MOZ_CRASHREPORTER"] = "1"
     env["MOZ_CRASHREPORTER_SHUTDOWN"] = "1"
     env["MOZ_DISABLE_NONLOCAL_CONNECTIONS"] = "1"