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-rw-r--r--src/intervals.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/intervals.c b/src/intervals.c
index 0e3b684f570..f2a2a16f4ad 100644
--- a/src/intervals.c
+++ b/src/intervals.c
@@ -676,6 +676,7 @@ find_interval (register INTERVAL tree, register ptrdiff_t position)
while (1)
{
+ eassert (tree);
if (relative_position < LEFT_TOTAL_LENGTH (tree))
{
tree = tree->left;