diff --git a/proxmoxtf/resource/container.go b/proxmoxtf/resource/container.go
index 38467201..8ae4138c 100644
--- a/proxmoxtf/resource/container.go
+++ b/proxmoxtf/resource/container.go
@@ -605,10 +605,13 @@ func Container() *schema.Resource {
 				},
 			},
 			mkResourceVirtualEnvironmentContainerTags: {
-				Type:                  schema.TypeList,
-				Description:           "Tags of the container. This is only meta information.",
-				Optional:              true,
-				Elem:                  &schema.Schema{Type: schema.TypeString},
+				Type:        schema.TypeList,
+				Description: "Tags of the container. This is only meta information.",
+				Optional:    true,
+				Elem: &schema.Schema{
+					Type:         schema.TypeString,
+					ValidateFunc: validation.StringIsNotEmpty,
+				},
 				DiffSuppressFunc:      suppressIfListsAreEqualIgnoringOrder,
 				DiffSuppressOnRefresh: true,
 			},
diff --git a/proxmoxtf/resource/vm.go b/proxmoxtf/resource/vm.go
index 6da17b15..b7f7a4da 100644
--- a/proxmoxtf/resource/vm.go
+++ b/proxmoxtf/resource/vm.go
@@ -1117,10 +1117,13 @@ func VM() *schema.Resource {
 				Default:     dvResourceVirtualEnvironmentVMTabletDevice,
 			},
 			mkResourceVirtualEnvironmentVMTags: {
-				Type:                  schema.TypeList,
-				Description:           "Tags of the virtual machine. This is only meta information.",
-				Optional:              true,
-				Elem:                  &schema.Schema{Type: schema.TypeString},
+				Type:        schema.TypeList,
+				Description: "Tags of the virtual machine. This is only meta information.",
+				Optional:    true,
+				Elem: &schema.Schema{
+					Type:         schema.TypeString,
+					ValidateFunc: validation.StringIsNotEmpty,
+				},
 				DiffSuppressFunc:      suppressIfListsAreEqualIgnoringOrder,
 				DiffSuppressOnRefresh: true,
 			},