{"record":{"id":"b35fff1cfa26db5c","repo":"bevyengine/bevy","slug":"novaluestoupload","errorCode":"NoValuesToUpload","errorMessage":"there are no values to upload","messagePattern":"there are no values to upload","errorType":"error_code","errorClass":"WriteBufferRangeError","httpStatus":null,"severity":"warning","filePath":"crates/bevy_render/src/render_resource/buffer_vec.rs","lineNumber":984,"sourceCode":"    /// Pushes `count` copies of `T::default` to the array.\n    pub fn push_multiple_init(&mut self, count: usize) -> usize {\n        debug_assert_eq!(self.uninit_element_count, 0);\n        let index = self.values.len();\n        self.values.extend(iter::repeat_n(T::default(), count));\n        index\n    }\n}\n\n/// Error returned when `write_buffer_range` fails\n///\n/// See [`RawBufferVec::write_buffer_range`] [`BufferVec::write_buffer_range`]\n#[derive(Debug, Eq, PartialEq, Copy, Clone, Error)]\npub enum WriteBufferRangeError {\n    #[error(\"the range is bigger than the capacity of the buffer\")]\n    RangeBiggerThanBuffer,\n    #[error(\"the gpu buffer is not initialized\")]\n    BufferNotInitialized,\n    #[error(\"there are no values to upload\")]\n    NoValuesToUpload,\n}\n\n#[inline]\n#[cfg_attr(\n    not(feature = \"type_label_buffers\"),\n    expect(\n        clippy::extra_unused_type_parameters,\n        reason = \"conditional compilation\"\n    )\n)]\npub(crate) fn make_buffer_label<'a, T>(label: &'a Option<String>) -> Option<&'a str> {\n    #[cfg(feature = \"type_label_buffers\")]\n    if label.is_none() {\n        return Some(core::any::type_name::<T>());\n    }\n    label.as_deref()\n}","sourceCodeStart":966,"sourceCodeEnd":1002,"githubUrl":"https://github.com/bevyengine/bevy/blob/396ca727080776bd313bb892423b7d94e03b81b4/crates/bevy_render/src/render_resource/buffer_vec.rs#L966-L1002","documentation":"WriteBufferRangeError::NoValuesToUpload is returned when write_buffer_range is called while the CPU-side values vector is empty (buffer_vec.rs:201-203). There is nothing to write, so the method refuses rather than performing a zero-byte upload. It is effectively a benign precondition failure signalling an empty buffer.","triggerScenarios":"Calling write_buffer_range on a cleared or never-filled BufferVec - e.g. after clear() when all entities were removed, or on the first frame before any push.","commonSituations":"Per-frame instance buffers whose population varies (all lights removed, all meshes culled/removed); startup frames before data arrives; loops that write on a schedule regardless of whether items exist.","solutions":["Guard the call: only write when !vec.is_empty().","Treat the variant as benign in match arms (debug-level log or ignore) if empty states are expected.","If data should exist, check why the population system produced no values."],"exampleFix":"// before\nvec.clear();\nvec.write_buffer_range(queue, 0..vec.len())?; // Err(NoValuesToUpload) on empty vec\n\n// after\nif !vec.is_empty() {\n    vec.write_buffer_range(queue, 0..vec.len())?;\n}","handlingStrategy":"validation","validationCode":"if !vec.is_empty() {\n    vec.write_buffer_range(queue, 0..vec.len())?;\n}","typeGuard":null,"tryCatchPattern":"match vec.write_buffer_range(queue, 0..vec.len()) {\n    Err(WriteBufferRangeError::NoValuesToUpload) => { /* nothing to upload this frame */ }\n    other => other?,\n}","preventionTips":["Guard uploads with an is_empty() check when populations vary per frame.","Treat this variant as informational in match arms, not as a failure.","Investigate population systems if the buffer is unexpectedly empty."],"tags":["bevy","buffer-vec","empty","gpu-upload"],"backgroundTag":"empty-buffer-write","analyzedSha":"396ca727080776bd313bb892423b7d94e03b81b4","analyzedAt":"2026-08-20T16:12:39.808Z","contentChangedAt":"2026-08-20T16:12:39.808Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}