Update tabix reader

open2c · Feb 9, 2017 · 5c0d349 · 5c0d349
1 parent b9efd0f
commit 5c0d349
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/cooler/_reader.py b/cooler/_reader.py
@@ -220,6 +220,8 @@ def __getstate__(self):
         return d
 
     def _size(self, chrom):
+        if chrom not in self.contigs:
+            return None
         import pysam
         with pysam.TabixFile(self.filepath, 'r', encoding='ascii') as f:
             return sum(1 for line in f.fetch(chrom))