fixed pop_pivot for Z/2Z coefficients

1 files changed, 2 insertions, 4 deletions

diff --git a/ripser.cpp b/ripser.cpp
index 51b3d9e..e166080 100644
--- a/ripser.cpp
+++ b/ripser.cpp
@@ -531,10 +531,8 @@ public:
 		while (!column.empty()) {
 			pivot = column.top();
 			column.pop();
-			if (!column.empty()) {
-				if (get_index(column.top()) != get_index(pivot)) return pivot;
-				column.pop();
-			}
+			if (column.empty() || get_index(column.top()) != get_index(pivot)) return pivot;
+			column.pop();
 		}
 		pivot = -1;
 #endif