[BugFix] Fix the multiple items check (#6294)

* check for multiple items when no info

* check for , and ; only if it's a str

---------

Co-authored-by: hjoaquim <h.joaquim@campus.fct.unl.pt>

2 files changed, 12 insertions, 1 deletions

diff --git a/openbb_platform/core/openbb_core/app/static/utils/filters.py b/openbb_platform/core/openbb_core/app/static/utils/filters.py
index 32a92138586..b2262a1e8c8 100644
--- a/openbb_platform/core/openbb_core/app/static/utils/filters.py
+++ b/openbb_platform/core/openbb_core/app/static/utils/filters.py
@@ -42,5 +42,16 @@ def filter_inputs(
 
                         kwargs[p][field] = new
                         break
+    else:
+        provider = kwargs.get("provider_choices", {}).get("provider")
+        for param_category in ("standard_params", "extra_params"):
+            if param_category in kwargs:
+                for field, value in kwargs[param_category].items():
+                    if isinstance(value, list):
+                        kwargs[param_category][field] = ",".join(map(str, value))
+                    check_single_item(
+                        kwargs[param_category][field],
+                        f"{field} -> multiple items not allowed for '{provider}'",
+                    )
 
     return kwargs
diff --git a/openbb_platform/core/openbb_core/app/utils.py b/openbb_platform/core/openbb_core/app/utils.py
index f7c6c1ca7dc..452300c4334 100644
--- a/openbb_platform/core/openbb_core/app/utils.py
+++ b/openbb_platform/core/openbb_core/app/utils.py
@@ -166,6 +166,6 @@ def check_single_item(
     value: Optional[str], message: Optional[str] = None
 ) -> Optional[str]:
     """Check that string contains a single item."""
-    if value and ("," in value or ";" in value):
+    if value and isinstance(value, str) and ("," in value or ";" in value):
         raise OpenBBError(message if message else "multiple items not allowed")
     return value