diff --git a/src/utils/exportAs/dbml.js b/src/utils/exportAs/dbml.js
index 4bb4d4c..53092a9 100644
--- a/src/utils/exportAs/dbml.js
+++ b/src/utils/exportAs/dbml.js
@@ -55,7 +55,7 @@ function cardinality(rel) {
 function fieldSize(field, database) {
   const typeMetadata = dbToTypes[database][field.type];
 
-  if ((typeMetadata.isSized || typeMetadata.hasPrecision) && field.size)
+  if ((typeMetadata?.isSized || typeMetadata?.hasPrecision) && field.size)
     return `(${field.size})`;
 
   return "";