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diff --git a/libcds/src/static_sequence/wt_node_leaf.cpp b/libcds/src/static_sequence/wt_node_leaf.cpp
index e3b7c19..d99ea62 100644
--- a/libcds/src/static_sequence/wt_node_leaf.cpp
+++ b/libcds/src/static_sequence/wt_node_leaf.cpp
@@ -31,20 +31,18 @@ wt_node_leaf::wt_node_leaf() {}
 wt_node_leaf::~wt_node_leaf() {}
 
 uint wt_node_leaf::rank(uint symbol, uint pos, uint l, wt_coder * c) {
-	assert(symbol==this->symbol);
+	if(symbol!=this->symbol) return 0;
 	pos++;
-	assert(pos<=count);
 	return pos;
 }
 
 uint wt_node_leaf::select(uint symbol, uint pos, uint l, wt_coder * c) {
-	assert(symbol==this->symbol);
-	assert(pos<=count && pos>0);
+	if(symbol!=this->symbol) return (uint)-1;
+	if(pos==0 || pos>count) return (uint)-1;
 	return pos;
 }
 
 uint wt_node_leaf::access(uint pos) {
-	assert(pos<count);
 	return symbol;
 }