diff --git a/main/flaredetector/util.py b/main/flaredetector/util.py
index e97f8f5..65d73ce 100644
--- a/main/flaredetector/util.py
+++ b/main/flaredetector/util.py
@@ -9,6 +9,8 @@ def findMaxIndices(lc, num=3, distance=100):
         data = lc.power
     elif(isinstance(lc, LightCurve)):
         data = lc.flux
+    else:
+        return np.zeros(num)-1
     peak_indices, peak_dict = find_peaks(data, height=(None, None), distance=distance)
     peak_heights = peak_dict["peak_heights"]
     maxIndices = peak_indices[np.argsort(peak_heights)[-num:][::-1]]