diff --git a/api/models/schema/userSchema.js b/api/models/schema/userSchema.js
index 80e635fc60..6b1d010346 100644
--- a/api/models/schema/userSchema.js
+++ b/api/models/schema/userSchema.js
@@ -51,28 +51,18 @@ const userSchema = mongoose.Schema(
     },
     googleId: {
       type: String,
-      unique: true,
-      sparse: true,
     },
     facebookId: {
       type: String,
-      unique: true,
-      sparse: true,
     },
     openidId: {
       type: String,
-      unique: true,
-      sparse: true,
     },
     githubId: {
       type: String,
-      unique: true,
-      sparse: true,
     },
     discordId: {
       type: String,
-      unique: true,
-      sparse: true,
     },
     plugins: {
       type: Array,
@@ -85,4 +75,25 @@ const userSchema = mongoose.Schema(
   { timestamps: true },
 );
 
+userSchema.index(
+  { googleId: 1 },
+  { unique: true, partialFilterExpression: { googleId: { $type: 'string' } } },
+);
+userSchema.index(
+  { facebookId: 1 },
+  { unique: true, partialFilterExpression: { facebookId: { $type: 'string' } } },
+);
+userSchema.index(
+  { openidId: 1 },
+  { unique: true, partialFilterExpression: { openidId: { $type: 'string' } } },
+);
+userSchema.index(
+  { githubId: 1 },
+  { unique: true, partialFilterExpression: { githubId: { $type: 'string' } } },
+);
+userSchema.index(
+  { discordId: 1 },
+  { unique: true, partialFilterExpression: { discordId: { $type: 'string' } } },
+);
+
 module.exports = userSchema;