Ensure maps are initialised before parsing sql

db/db.go

@@ -86,6 +86,14 @@ func Exit() {
 // Execute parses the query and executes it against the data layer
 func Execute(ctx *fibre.Context, txt interface{}, vars map[string]interface{}) (out []*Response, err error) {
 
+	// If no preset variables have been defined
+	// then ensure that the variables is
+	// instantiated for future use.
+
+	if vars == nil {
+		vars = make(map[string]interface{})
+	}
+
 	// Parse the received SQL batch query strings
 	// into SQL ASTs, using any immutable preset
 	// variables if set.
@@ -95,14 +103,6 @@ func Execute(ctx *fibre.Context, txt interface{}, vars map[string]interface{}) (
 		return
 	}
 
-	// If no preset variables have been defined
-	// then ensure that the variables is
-	// instantiated for future use.
-
-	if vars == nil {
-		vars = make(map[string]interface{})
-	}
-
 	// Create 2 channels, one for force quitting
 	// the query processor, and the other for
 	// receiving and buffering any query results.