Index: ext/rtree/rtree.c
==================================================================
--- ext/rtree/rtree.c
+++ ext/rtree/rtree.c
@@ -1180,11 +1180,11 @@
   }
   i = pCur->nPoint++;
   pNew = pCur->aPoint + i;
   pNew->rScore = rScore;
   pNew->iLevel = iLevel;
-  assert( iLevel>=0 && iLevel<=RTREE_MAX_DEPTH );
+  assert( iLevel<=RTREE_MAX_DEPTH );
   while( i>0 ){
     RtreeSearchPoint *pParent;
     j = (i-1)/2;
     pParent = pCur->aPoint + j;
     if( rtreeSearchPointCompare(pNew, pParent)>=0 ) break;