diff --git a/src/core/api/types/stockOperation/StockOperationType.ts b/src/core/api/types/stockOperation/StockOperationType.ts
index 30bc27d3..0170d349 100644
--- a/src/core/api/types/stockOperation/StockOperationType.ts
+++ b/src/core/api/types/stockOperation/StockOperationType.ts
@@ -36,7 +36,7 @@ export enum OperationType {
 }
 
 export function operationFromString(str: string): OperationType | undefined {
-  str = str.toLowerCase();
+  str = str?.toLowerCase();
   if (str === OperationType.TRANSFER_OUT_OPERATION_TYPE)
     return OperationType.TRANSFER_OUT_OPERATION_TYPE;
   if (str === OperationType.DISPOSED_OPERATION_TYPE)
diff --git a/src/core/components/table/table.component.tsx b/src/core/components/table/table.component.tsx
index 0768fb7a..3f6567c1 100644
--- a/src/core/components/table/table.component.tsx
+++ b/src/core/components/table/table.component.tsx
@@ -85,13 +85,13 @@ const DataList: React.FC<ListProps> = ({
       headers.some(({ key }) => {
         const cellId = getCellId(rowId, key);
         const filterableValue = cellsById[cellId].value;
-        const filterTerm = inputValue.toLowerCase();
+        const filterTerm = inputValue?.toLowerCase();
 
         if (typeof filterableValue === "boolean") {
           return false;
         }
 
-        return ("" + filterableValue).toLowerCase().includes(filterTerm);
+        return ("" + filterableValue)?.toLowerCase().includes(filterTerm);
       })
     );
   };
diff --git a/src/core/utils/datetimeUtils.ts b/src/core/utils/datetimeUtils.ts
index 24e971f9..b5cdf938 100644
--- a/src/core/utils/datetimeUtils.ts
+++ b/src/core/utils/datetimeUtils.ts
@@ -48,7 +48,7 @@ export const ParseDate = (value: string | null | undefined) => {
   let date = null;
   try {
     if (!value) return date;
-    value = value.toLowerCase();
+    value = value?.toLowerCase();
     if (value.includes("jan")) value = value.replace("jan", "01");
     else if (value.includes("feb")) value = value.replace("feb", "02");
     else if (value.includes("mar")) value = value.replace("mar", "03");
diff --git a/src/stock-items/add-stock-item/concepts-selector/concepts-selector.component.tsx b/src/stock-items/add-stock-item/concepts-selector/concepts-selector.component.tsx
index dab3d6eb..8f53c61b 100644
--- a/src/stock-items/add-stock-item/concepts-selector/concepts-selector.component.tsx
+++ b/src/stock-items/add-stock-item/concepts-selector/concepts-selector.component.tsx
@@ -33,8 +33,8 @@ const ConceptsSelector = <T,>(props: ConceptsSelectorProps<T>) => {
       ? concepts
       : concepts.filter((concept) =>
           concept.display
-            .toLowerCase()
-            .includes(inputValue.trim().toLowerCase())
+            ?.toLowerCase()
+            .includes(inputValue.trim()?.toLowerCase())
         );
   }, [inputValue, concepts]);
 
diff --git a/src/stock-operations/add-stock-operation/base-operation-details.component.tsx b/src/stock-operations/add-stock-operation/base-operation-details.component.tsx
index d9aa9050..2e884f6f 100644
--- a/src/stock-operations/add-stock-operation/base-operation-details.component.tsx
+++ b/src/stock-operations/add-stock-operation/base-operation-details.component.tsx
@@ -1,4 +1,4 @@
-import React, { useState } from "react";
+import React, { useState, useEffect } from "react";
 import { useTranslation } from "react-i18next";
 import { StockOperationDTO } from "../../core/api/types/stockOperation/StockOperationDTO";
 import { SaveStockOperation } from "../../stock-items/types";
@@ -83,6 +83,12 @@ const BaseOperationDetails: React.FC<BaseOperationDetailsProps> = ({
 
   const [isOtherUser, setIsOtherUser] = useState<boolean | null>();
   const [isSaving, setIsSaving] = useState(false);
+  useEffect(() => {
+    if (defaultLoggedUserUuid) {
+      setValue("responsiblePersonUuid", defaultLoggedUserUuid);
+    }
+  }, [defaultLoggedUserUuid, setValue]);
+
   if (isLoading) {
     return (
       <InlineLoading
diff --git a/src/stock-user-role-scopes/add-stock-user-scope/add-stock-user-role-scope.component.tsx b/src/stock-user-role-scopes/add-stock-user-scope/add-stock-user-role-scope.component.tsx
index b6a93762..91babe8d 100644
--- a/src/stock-user-role-scopes/add-stock-user-scope/add-stock-user-role-scope.component.tsx
+++ b/src/stock-user-role-scopes/add-stock-user-scope/add-stock-user-role-scope.component.tsx
@@ -114,7 +114,7 @@ const AddStockUserRoleScope: React.FC<AddStockUserRoleScopeProps> = ({
         .filter((item: any) => item.uuid !== loggedInUserUuid)
         .filter((item: any) => {
           const displayName = item?.person?.display ?? item?.display ?? "";
-          return displayName.toLowerCase().includes(query.toLowerCase());
+          return displayName?.toLowerCase().includes(query?.toLowerCase());
         });
       setFilteredItems(filtered);
     }