diff --git a/services/web/scripts/fix_collaborator_refs_null.mjs b/services/web/scripts/fix_collaborator_refs_null.mjs
new file mode 100644
index 0000000000..062662a5f8
--- /dev/null
+++ b/services/web/scripts/fix_collaborator_refs_null.mjs
@@ -0,0 +1,175 @@
+import minimist from 'minimist'
+import {
+  db,
+  ObjectId,
+  READ_PREFERENCE_SECONDARY,
+} from '../app/src/infrastructure/mongodb.js'
+import lodash from 'lodash'
+
+const args = minimist(process.argv.slice(2), {
+  boolean: ['commit'],
+})
+
+const run = async () => {
+  try {
+    const projects = await db.projectAuditLogEntries
+      .find(
+        {
+          operation: 'collaborator-limit-exceeded',
+          timestamp: {
+            $gte: new Date('2025-03-26'),
+            $lt: new Date('2025-04-02'),
+          },
+        },
+        {
+          readPreference: READ_PREFERENCE_SECONDARY,
+          projection: {
+            _id: 1,
+            projectId: 1,
+          },
+        }
+      )
+      .toArray()
+
+    const uniqueProjectIds = lodash.uniq(
+      projects.map(p => p.projectId.toString())
+    )
+
+    console.log(
+      `Found ${uniqueProjectIds.length} projects where collaborator-limit-exceeded operation was logged in provided date range`
+    )
+
+    let readOnlyCount = 0
+    let pendingReviewerCount = 0
+    let reviewerCount = 0
+
+    for (const projectId of uniqueProjectIds) {
+      if (args.commit) {
+        const readOnlyUpdate = await db.projects.updateOne(
+          {
+            _id: new ObjectId(projectId),
+            readOnly_refs: null,
+          },
+          {
+            $set: {
+              readOnly_refs: [],
+            },
+          }
+        )
+        if (readOnlyUpdate.modifiedCount > 0) {
+          console.log(`Updated readOnly_refs for project id ${projectId}`)
+        }
+        readOnlyCount += readOnlyUpdate.modifiedCount
+      } else {
+        const project = await db.projects.findOne(
+          {
+            _id: new ObjectId(projectId),
+            readOnly_refs: null,
+          },
+          {
+            projection: {
+              _id: 1,
+              readOnly_refs: 1,
+            },
+          }
+        )
+        if (project) {
+          readOnlyCount++
+          console.log(
+            `Dry run: Would update readOnly_refs for project id ${projectId}`
+          )
+        }
+      }
+
+      if (args.commit) {
+        const pendingReviewerUpdate = await db.projects.updateOne(
+          {
+            _id: new ObjectId(projectId),
+            pendingReviewer_refs: null,
+          },
+          {
+            $set: {
+              pendingReviewer_refs: [],
+            },
+          }
+        )
+        if (pendingReviewerUpdate.modifiedCount > 0) {
+          console.log(
+            `Updated pendingReviewer_refs for project id ${projectId}`
+          )
+        }
+        pendingReviewerCount += pendingReviewerUpdate.modifiedCount
+      } else {
+        const project = await db.projects.findOne(
+          {
+            _id: new ObjectId(projectId),
+            pendingReviewer_refs: null,
+          },
+          {
+            projection: {
+              _id: 1,
+              pendingReviewer_refs: 1,
+            },
+          }
+        )
+        if (project) {
+          pendingReviewerCount++
+          console.log(
+            `Dry run: Would update pendingReviewer_refs for project id ${projectId}`
+          )
+        }
+      }
+
+      if (args.commit) {
+        const reviewerUpdate = await db.projects.updateOne(
+          {
+            _id: new ObjectId(projectId),
+            reviewer_refs: null,
+          },
+          {
+            $set: {
+              reviewer_refs: [],
+            },
+          }
+        )
+        reviewerCount += reviewerUpdate.modifiedCount
+      } else {
+        const project = await db.projects.findOne(
+          {
+            _id: new ObjectId(projectId),
+            reviewer_refs: null,
+          },
+          {
+            projection: {
+              _id: 1,
+              reviewer_refs: 1,
+            },
+          }
+        )
+        if (project) {
+          reviewerCount++
+          console.log(
+            `Dry run: Would update reviewer_refs for project id ${projectId}`
+          )
+        }
+      }
+    }
+
+    if (args.commit) {
+      console.log(
+        `Updated readOnly_refs for ${readOnlyCount} projects, pendingReviewer_refs for ${pendingReviewerCount} projects, and reviewer_refs for ${reviewerCount} projects.`
+      )
+    } else {
+      console.log(
+        `Dry run: Would update readOnly_refs for ${readOnlyCount} projects, pendingReviewer_refs for ${pendingReviewerCount} projects, and reviewer_refs for ${reviewerCount} projects.`
+      )
+    }
+
+    process.exit(0)
+  } catch (err) {
+    console.error('Error while processing projects:', err)
+    process.exit(1)
+  }
+}
+
+run()