diff --git a/server/storage.ts b/server/storage.ts
index 595711f..cb2be81 100644
--- a/server/storage.ts
+++ b/server/storage.ts
@@ -60,6 +60,11 @@ export class DatabaseStorage implements IStorage {
       userData.password = await this.hashPassword(userData.password);
     }
     
+    // Convert empty email to null to avoid unique constraint issues
+    if (userData.email === "") {
+      userData.email = null;
+    }
+    
     const [user] = await db
       .insert(users)
       .values(userData)
@@ -73,6 +78,11 @@ export class DatabaseStorage implements IStorage {
       userData.password = await this.hashPassword(userData.password);
     }
     
+    // Convert empty email to null to avoid unique constraint issues
+    if (userData.email === "") {
+      userData.email = null;
+    }
+    
     const [user] = await db
       .update(users)
       .set(userData)