diff --git a/code/lib/lmdk_bgt.py b/code/lib/lmdk_bgt.py
index 1935d78..4ca1a1e 100644
--- a/code/lib/lmdk_bgt.py
+++ b/code/lib/lmdk_bgt.py
@@ -446,7 +446,7 @@ def discount(seq, lmdks, epsilon):
   samp_rt = .5
   for i, p in enumerate(seq):
     # Adjust the sampling rate
-    if lmdks:
+    if len(lmdks):
       samp_rt = datetime.fromtimestamp(int(lmdks[lmdk_cur][3]))/datetime.fromtimestamp(int(lmdks[len(lmdks) - 1][3]))
     # Check if current point is a landmark
     if lmdk_lib.is_landmark(p, lmdks):