diff --git a/src/validation.go b/src/validation.go
index a4dba91..47357b1 100644
--- a/src/validation.go
+++ b/src/validation.go
@@ -123,6 +123,8 @@ func validateConditionPattern(condType, pattern string) error {
 	case "keyword":
 		// Keywords can be any non-empty string
 		return nil
+	default:
+		return fmt.Errorf("Invalid condition type: %s", condType)
 	}
 
 	return nil
diff --git a/src/validation_test.go b/src/validation_test.go
index 95464df..8e667d7 100644
--- a/src/validation_test.go
+++ b/src/validation_test.go
@@ -303,6 +303,12 @@ func TestValidateConditionPattern(t *testing.T) {
 			pattern:  "",
 			wantErr:  true,
 		},
+		{
+			name:     "invalid condition type",
+			condType: "invalid_type",
+			pattern:  "example.com",
+			wantErr:  true,
+		},
 	}
 
 	for _, tt := range tests {
@@ -381,6 +387,14 @@ func TestIsConditionValid(t *testing.T) {
 			},
 			want: false,
 		},
+		{
+			name: "invalid condition type",
+			condition: Condition{
+				Type:    "invalid_type",
+				Pattern: "example.com",
+			},
+			want: false,
+		},
 	}
 
 	for _, tt := range tests {
@@ -449,6 +463,14 @@ func TestAreAllConditionsValid(t *testing.T) {
 			},
 			want: false,
 		},
+		{
+			name: "invalid condition type in list",
+			conditions: []Condition{
+				{Type: "domain", Pattern: "example.com"},
+				{Type: "invalid_type", Pattern: "example.com"},
+			},
+			want: false,
+		},
 	}
 
 	for _, tt := range tests {