Index: src/whereexpr.c
==================================================================
--- src/whereexpr.c
+++ src/whereexpr.c
@@ -282,22 +282,27 @@
         ** LIKE optimization.  See, for example:
         **    2018-09-10 https://sqlite.org/src/info/c94369cae9b561b1
         **    2019-05-02 https://sqlite.org/src/info/b043a54c3de54b28
         **    2019-06-10 https://sqlite.org/src/info/fd76310a5e843e07
         **    2019-06-14 https://sqlite.org/src/info/ce8717f0885af975
+        **    2019-09-03 https://sqlite.org/src/info/0f0428096f17252a
         */
         if( pLeft->op!=TK_COLUMN 
          || sqlite3ExprAffinity(pLeft)!=SQLITE_AFF_TEXT 
          || IsVirtual(pLeft->y.pTab)  /* Value might be numeric */
         ){
           int isNum;
           double rDummy;
           isNum = sqlite3AtoF(zNew, &rDummy, iTo, SQLITE_UTF8);
           if( isNum<=0 ){
-            zNew[iTo-1]++;
-            isNum = sqlite3AtoF(zNew, &rDummy, iTo, SQLITE_UTF8);
-            zNew[iTo-1]--;
+            if( iTo==1 && zNew[0]=='-' ){
+              isNum = +1;
+            }else{
+              zNew[iTo-1]++;
+              isNum = sqlite3AtoF(zNew, &rDummy, iTo, SQLITE_UTF8);
+              zNew[iTo-1]--;
+            }
           }
           if( isNum>0 ){
             sqlite3ExprDelete(db, pPrefix);
             sqlite3ValueFree(pVal);
             return 0;

Index: test/like3.test
==================================================================
--- test/like3.test
+++ test/like3.test
@@ -204,10 +204,23 @@
   DROP TABLE IF EXISTS t0;
   CREATE TABLE t0(c0 INT UNIQUE COLLATE NOCASE);
   INSERT INTO t0(c0) VALUES ('.1%');
   SELECT * FROM t0 WHERE t0.c0 LIKE '.1%';
 } {.1%}
+
+# 2019-09-03
+# Ticket https://www.sqlite.org/src/info/0f0428096f
+do_execsql_test like3-5.420 {
+  DROP TABLE IF EXISTS t0;
+  CREATE TABLE t0(c0 UNIQUE);
+  INSERT INTO t0(c0) VALUES(-1);
+  SELECT * FROM t0 WHERE t0.c0 GLOB '-*';
+} {-1}
+do_execsql_test like3-5.421 {
+  SELECT t0.c0 GLOB '-*' FROM t0;
+} {1}
+
 
 
 # 2019-02-27
 # Verify that the LIKE optimization works with an ESCAPE clause when
 # using PRAGMA case_sensitive_like=ON.