diff --git a/Tusker/CoreData/MastodonCachePersistentStore.swift b/Tusker/CoreData/MastodonCachePersistentStore.swift
index 346f0e36..5910a7ea 100644
--- a/Tusker/CoreData/MastodonCachePersistentStore.swift
+++ b/Tusker/CoreData/MastodonCachePersistentStore.swift
@@ -72,12 +72,27 @@ class MastodonCachePersistentStore: NSPersistentContainer {
         }
         do {
             try context.save()
-        } catch {
+        } catch let error as NSError {
             logger.error("Unable to save managed object context: \(String(describing: error), privacy: .public)")
             let crumb = Breadcrumb(level: .fatal, category: "PersistentStore")
-            crumb.message = String(describing: error)
+            // note: NSDetailedErrorsKey == "NSDetailedErrorsKey" != "NSDetailedErrors"
+            if let detailed = error.userInfo["NSDetailedErrors"] as? [NSError] {
+                crumb.data = [
+                    "errors": detailed.compactMap { error -> [String: Any?]? in
+                        guard let object = error.userInfo[NSValidationObjectErrorKey] as? NSManagedObject else {
+                            return nil
+                        }
+                        return [
+                            "entity": object.entity.name,
+                            "key": error.userInfo[NSValidationKeyErrorKey],
+                            "value": error.userInfo[NSValidationValueErrorKey],
+                            "message": error.localizedDescription,
+                        ]
+                    }
+                ]
+            }
             SentrySDK.addBreadcrumb(crumb: crumb)
-            fatalError("Unable to save managed object context")
+            fatalError("Unable to save managed object context: \(String(describing: error))")
         }
     }