diff --git a/lx/spectraContainer.py b/lx/spectraContainer.py
index c115d968a59ec9d30c2f48171f4ace1315b5b171..9947d1c66d2692a1bdc62c63722dbef1d8cd1f27 100644
--- a/lx/spectraContainer.py
+++ b/lx/spectraContainer.py
@@ -1042,7 +1042,7 @@ MStolerance to an arbitrary value"""
 
 						# if the threshold is given as a relative value make absolute value
 						if threshold_type == 'relative':
-							t[sample] = threshold * dictBasePeakIntensity[sample]
+							t[sample] = threshold * dictBasePeakIntensity[sample] if dictBasePeakIntensity[sample] is not None else 0 # if its none there where no peaks
 						else:
 							t[sample] = threshold