Patch downloaded from https://github.com/clementine-player/Clementine/pull/5669 .

diff -ruN clementine-1.3.1.565.gd20c2244a.orig/src/core/database.cpp clementine-1.3.1.565.gd20c2244a/src/core/database.cpp
--- clementine-1.3.1.565.gd20c2244a.orig/src/core/database.cpp	2018-07-07 23:59:24.018540126 +0200
+++ clementine-1.3.1.565.gd20c2244a/src/core/database.cpp	2018-07-08 00:04:47.991551728 +0200
@@ -265,6 +265,17 @@
   StaticInit();
 
   {
+
+#ifdef SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER
+    // In case sqlite>=3.12 is compiled without -DSQLITE_ENABLE_FTS3_TOKENIZER
+    // (generally a good idea  due to security reasons) the fts3 support should be enabled explicitly.
+    QVariant v = db.driver()->handle();
+    if (v.isValid() && qstrcmp(v.typeName(), "sqlite3*") == 0) {
+      sqlite3 *handle = *static_cast<sqlite3**>(v.data());
+      if (handle) sqlite3_db_config(handle, SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER, 1, NULL);
+    }
+#endif
+
     QSqlQuery set_fts_tokenizer(db);
     set_fts_tokenizer.prepare("SELECT fts3_tokenizer(:name, :pointer)");
     set_fts_tokenizer.bindValue(":name", "unicode");
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