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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"io.objectbox.exception.DbException: Could not get from cursor (-30787) (error code -30787)","articleBody":"### Is there an existing issue?\n\n- [x] I have searched [existing issues](https://github.com/objectbox/objectbox-java/issues?q=is%3Aissue%20state%3Aclosed%2030787)\n\n### Build info\n\n- ObjectBox version: 4.1.0\n- OS: Android 9\n- Device/ABI/architecture: Tablet Lilliput\n\n### Steps to reproduce\n\nI haven't been able to replicate the problem, but it happens frequently on devices I don't have access to.\n\n\n### Expected behavior\n\nUnderstanding the problem is key to solving it.\n\n\n### Actual behavior\n\nThe application is crashing when trying to call a simple query.\n\n### Code\n\n\u003cdetails\u003e\u003csummary\u003eCode\u003c/summary\u003e\n\n```java\n override suspend fun getMessageCountFromDatabase(): Long {\n        val box = equipmentMessageBoxStore.getBox(EquipmentMessageEnvelopeDTO::class.java)\n\n        val count = box.query()\n            .equal(EquipmentMessageEnvelopeDTO_.status, EquipmentMessageStatus.READY.value.toLong())\n            .build()\n            .use { it.count() }\n\n        return count\n    }\n```\nInit:\n\n```java\n   @Provides\n    @Singleton\n    @EquipmentMessageStore\n    fun provideBoxStoreMessages(\n        @ApplicationContext context: Context\n    ): BoxStore {\n        var boxStore: BoxStore\n        val storeBuilder = MyObjectBox.builder()\n            .validateOnOpenKv()\n            .androidContext(context)\n            .name(\"equipment-messages\")\n        boxStore = storeBuilder.build()\n        return boxStore\n    }\n```\n\n\n- Is there anything special about your app? No.\n- May transactions or multi-threading play a role? Yes.\n- Did you find any workarounds to prevent the issue? No.\n\n\u003c/details\u003e\n\n### Logs, stack traces\n\n\u003cdetails\u003e\u003csummary\u003eLogs, stack traces\u003c/summary\u003e\n\nio.objectbox.exception.DbException: Could not get from cursor (-30787) (error code -30787)\n\nUnfortunately, this couldn't be reproduced, so I only have a photo of the problem occurring on a device.\n\n\u003cimg width=\"1263\" height=\"132\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/7469521f-3f91-481b-b32f-a6fae6089db9\" /\u003e\n\n\u003c/details\u003e\n","author":{"url":"https://github.com/andreesperanca","@type":"Person","name":"andreesperanca"},"datePublished":"2025-11-21T19:10:58.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":9},"url":"https://github.com/1224/objectbox-java/issues/1224"}