diff --git a/project/ui/qprof_main.ipynb b/project/ui/qprof_main.ipynb
index ef62e5d2..18db5529 100644
--- a/project/ui/qprof_main.ipynb
+++ b/project/ui/qprof_main.ipynb
@@ -544,7 +544,7 @@
     "    global target_schema_val_2, key_val_2, statement_val, transaction_val\n",
     "    with output_1:\n",
     "        target_schema_val_2 = target_schema_2.value\n",
-    "        if not schema_exists(target_schema_val_2):\n",
+    "        if not target_schema_val_2 == \"\" and not schema_exists(target_schema_val_2):\n",
     "            print(\"\\033[91m\\033[1m Error! The schema does not exist. \\033[0m\\033[0m\")\n",
     "        else:\n",
     "            key_val_2 = key_2.value\n",
@@ -588,7 +588,7 @@
     "    global query_val, target_schema_val_2, key_val_2\n",
     "    with output_0:\n",
     "        target_schema_val_2 = target_schema_2.value\n",
-    "        if not schema_exists(target_schema_val_2):\n",
+    "        if not target_schema_val_2 == \"\" and not schema_exists(target_schema_val_2):\n",
     "            print(\"\\033[91m\\033[1m Error! The schema does not exist. \\033[0m\\033[0m\")\n",
     "        else:\n",
     "            key_val_2 = key_2.value\n",
@@ -630,7 +630,7 @@
     "            print(\"\\033[91m\\033[1m Error \\033[0m: Please check the input syntax. List of tuples is expected.\")\n",
     "        else:\n",
     "            target_schema_val_2 = target_schema_2.value\n",
-    "            if not schema_exists(target_schema_val_2):\n",
+    "            if not target_schema_val_2 == \"\" and not schema_exists(target_schema_val_2):\n",
     "                print(\"\\033[91m\\033[1m Error! The schema does not exist. \\033[0m\\033[0m\")\n",
     "            else:\n",
     "                key_val_2 = key_2.value\n",