diff --git a/code/lib/lmdk_bgt.py b/code/lib/lmdk_bgt.py
index b8e0b9f..1935d78 100644
--- a/code/lib/lmdk_bgt.py
+++ b/code/lib/lmdk_bgt.py
@@ -442,9 +442,12 @@ def discount(seq, lmdks, epsilon):
   lmdk_cur = 0
   # Track skipped releases
   skipped = 0
+  # Initialize the sampling rate
+  samp_rt = .5
   for i, p in enumerate(seq):
-    # The sampling rate
-    samp_rt = datetime.fromtimestamp(int(lmdks[lmdk_cur][3]))/datetime.fromtimestamp(int(lmdks[len(lmdks) - 1][3]))
+    # Adjust the sampling rate
+    if 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):
       lmdk_cur += 1