diff --git a/slsDetectorSoftware/tests/Caller/test-Caller-rx.cpp b/slsDetectorSoftware/tests/Caller/test-Caller-rx.cpp
index 66cc474d6..ebb3ff714 100644
--- a/slsDetectorSoftware/tests/Caller/test-Caller-rx.cpp
+++ b/slsDetectorSoftware/tests/Caller/test-Caller-rx.cpp
@@ -585,6 +585,9 @@ TEST_CASE("fpath", "[.cmdcall]") {
         REQUIRE(oss.str() == "fpath /tmp\n");
     }
     for (int i = 0; i != det.size(); ++i) {
+        if (prev_val[i].empty()) {
+            continue;
+        }
         det.setFilePath(prev_val[i], {i});
     }
 }