diff --git a/av1an.py b/av1an.py
index e54af3a4..b0bc9f69 100755
--- a/av1an.py
+++ b/av1an.py
@@ -83,7 +83,7 @@ def read_vmaf_xml(file):
         # Data
         x = [x for x in range(len(vmafs))]
         mean = round(sum(vmafs) / len(vmafs), 3)
-        calc = [x for x in vmafs if isinstance(x, float)]
+        calc = [x for x in vmafs if isinstance(x, float) and not isnan(x)]
         perc_1 = round(np.percentile(calc, 1), 3)
         perc_25 = round(np.percentile(calc, 25), 3)
         perc_75 = round(np.percentile(calc, 75), 3)