diff --git a/config/database/hsql/drop-schemas.sql b/config/database/hsql/drop-schemas.sql
index cf40ac87..a0de242f 100644
--- a/config/database/hsql/drop-schemas.sql
+++ b/config/database/hsql/drop-schemas.sql
@@ -1,9 +1,9 @@
-DROP TABLE ACCESS_AUDITORY;
-DROP TABLE TAG;
-DROP TABLE COLLABORATION;
-DROP TABLE COLLABORATION_PROPERTIES;
-DROP TABLE MINDMAP_HISTORY;
-DROP TABLE MINDMAP;
-DROP TABLE USER;
-DROP TABLE COLLABORATOR;
+DROP TABLE IF EXISTS ACCESS_AUDITORY;
+DROP TABLE IF EXISTS TAG;
+DROP TABLE IF EXISTS COLLABORATION;
+DROP TABLE IF EXISTS COLLABORATION_PROPERTIES;
+DROP TABLE IF EXISTS MINDMAP_HISTORY;
+DROP TABLE IF EXISTS MINDMAP;
+DROP TABLE IF EXISTS USER;
+DROP TABLE IF EXISTS COLLABORATOR;
 COMMIT;