diff --git a/src/components/olmap/BurstDetection/AnalysisParameters.test.ts b/src/components/olmap/BurstDetection/AnalysisParameters.test.ts
index 46be13f..fa083a5 100644
--- a/src/components/olmap/BurstDetection/AnalysisParameters.test.ts
+++ b/src/components/olmap/BurstDetection/AnalysisParameters.test.ts
@@ -17,7 +17,8 @@ describe("burst detection request", () => {
       sampling_interval_minutes: 15,
     });
     expect(state.detectionMode).toBe("latest");
-    expect(state.targetTime?.minute() % 15).toBe(0);
+    expect(state.targetTime).not.toBeNull();
+    expect(state.targetTime!.minute() % 15).toBe(0);
   });
 
   it("sends one target time for historical replay", () => {