Index: src/whereexpr.c
==================================================================
--- src/whereexpr.c
+++ src/whereexpr.c
@@ -783,16 +783,14 @@
     return 0;
   }
   pColl = sqlite3BinaryCompareCollSeq(pParse, pExpr->pLeft, pExpr->pRight);
   if( pColl==0 || sqlite3StrICmp(pColl->zName, "BINARY")==0 ) return 1;
   pColl = sqlite3ExprCollSeq(pParse, pExpr->pLeft);
-  /* Since pLeft and pRight are both a column references, their collating
-  ** sequence should always be defined. */
-  zColl1 = ALWAYS(pColl) ? pColl->zName : 0;
+  zColl1 = pColl ? pColl->zName : 0;
   pColl = sqlite3ExprCollSeq(pParse, pExpr->pRight);
-  zColl2 = ALWAYS(pColl) ? pColl->zName : 0;
-  return sqlite3StrICmp(zColl1, zColl2)==0;
+  zColl2 = pColl ? pColl->zName : 0;
+  return sqlite3_stricmp(zColl1, zColl2)==0;
 }
 
 /*
 ** Recursively walk the expressions of a SELECT statement and generate
 ** a bitmask indicating which tables are used in that expression

ADDED   test/collateB.test
Index: test/collateB.test
==================================================================
--- /dev/null
+++ test/collateB.test
@@ -0,0 +1,63 @@
+# 2016-07-01
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+# Test cases for a crash bug.
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+do_execsql_test collateB-1.1 {
+  CREATE TABLE t1(a INTEGER PRIMARY KEY);
+  CREATE TABLE t2(b INTEGER PRIMARY KEY, x1 INT COLLATE NOCASE);
+  CREATE TABLE t3(x2 INT);
+  SELECT * FROM t3, t2, t1 WHERE x2=b AND x1=a AND a=1;
+} {}
+do_execsql_test collateB-1.2 {
+  INSERT INTO t1(a) VALUES(1),(2),(3);
+  INSERT INTO t2(b,x1) VALUES(11,1),(22,2),(33,3);
+  INSERT INTO t3(x2) VALUES(11),(22),(33);
+  SELECT *,'|' FROM t3, t2, t1 WHERE x2=b AND x1=a AND a=1;
+} {11 11 1 1 |}
+do_execsql_test collateB-1.3 {
+  SELECT *,'|' FROM t3, t1, t2 WHERE x2=b AND x1=a AND a=1;
+} {11 1 11 1 |}
+do_execsql_test collateB-1.4 {
+  SELECT *,'|' FROM t2, t3, t1 WHERE x2=b AND x1=a AND a=1;
+} {11 1 11 1 |}
+do_execsql_test collateB-1.5 {
+  SELECT *,'|' FROM t2, t1, t3 WHERE x2=b AND x1=a AND a=1;
+} {11 1 1 11 |}
+do_execsql_test collateB-1.6 {
+  SELECT *,'|' FROM t1, t2, t3 WHERE x2=b AND x1=a AND a=1;
+} {1 11 1 11 |}
+do_execsql_test collateB-1.7 {
+  SELECT *,'|' FROM t1, t2, t3 WHERE x2=b AND x1=a AND a=1;
+} {1 11 1 11 |}
+do_execsql_test collateB-1.12 {
+  SELECT *,'|' FROM t3, t2, t1 WHERE b=x2 AND a=x1 AND 1=a;
+} {11 11 1 1 |}
+do_execsql_test collateB-1.13 {
+  SELECT *,'|' FROM t3, t1, t2 WHERE b=x2 AND a=x1 AND 1=a;
+} {11 1 11 1 |}
+do_execsql_test collateB-1.14 {
+  SELECT *,'|' FROM t2, t3, t1 WHERE b=x2 AND a=x1 AND 1=a;
+} {11 1 11 1 |}
+do_execsql_test collateB-1.15 {
+  SELECT *,'|' FROM t2, t1, t3 WHERE b=x2 AND a=x1 AND 1=a;
+} {11 1 1 11 |}
+do_execsql_test collateB-1.16 {
+  SELECT *,'|' FROM t1, t2, t3 WHERE b=x2 AND a=x1 AND 1=a;
+} {1 11 1 11 |}
+do_execsql_test collateB-1.17 {
+  SELECT *,'|' FROM t1, t2, t3 WHERE b=x2 AND a=x1 AND 1=a;
+} {1 11 1 11 |}
+
+finish_test