diff --git a/nuxt4-app/app/components/metabase/MetabaseCardDisplay.vue b/nuxt4-app/app/components/metabase/MetabaseCardDisplay.vue
index def91a2..ca0e54d 100644
--- a/nuxt4-app/app/components/metabase/MetabaseCardDisplay.vue
+++ b/nuxt4-app/app/components/metabase/MetabaseCardDisplay.vue
@@ -330,7 +330,7 @@ async function executeQuery() {
       // Determine parameter type based on tag type
       if (config.type === 'date') {
         paramType = 'date/single'
-        paramValue = parameterValues.value[tagName] || null
+        paramValue = parameterValues.value[tagName] || ''
       } else if (config.type === 'boolean') {
         paramType = 'boolean/='
         paramValue = parameterValues.value[tagName]
@@ -339,7 +339,7 @@ async function executeQuery() {
         paramValue = parameterValues.value[tagName] || null
       } else if (config.type === 'text') {
         paramType = 'string/='
-        paramValue = parameterValues.value[tagName] || null
+        paramValue = parameterValues.value[tagName] || ''
       }
 
       parameters.push({