diff --git a/libafl/src/mutators/multi.rs b/libafl/src/mutators/multi.rs
index c74daf1712..866629ae48 100644
--- a/libafl/src/mutators/multi.rs
+++ b/libafl/src/mutators/multi.rs
@@ -153,6 +153,9 @@ where
                     .map(|(idx, part)| (idx, part.bytes().len()));
 
                 if let Some((part_idx, size)) = maybe_size {
+                    if size == 0 {  // Workaround for a bug where parts are empty. The origin remains unknown.
+                        return Ok(MutationResult::Skipped);
+                    }
                     let target = state.rand_mut().below(size);
                     let range = rand_range(state, other_size, min(other_size, size - target));
 
@@ -195,6 +198,9 @@ where
             drop(other_testcase);
             let size = part.bytes().len();
 
+            if size == 0 {  // Workaround for a bug where parts are empty. The origin remains unknown.
+                return Ok(MutationResult::Skipped);
+            }
             let target = state.rand_mut().below(size);
             let range = rand_range(state, other_size, min(other_size, size - target));
 
@@ -257,6 +263,9 @@ where
                     .map(|(idx, part)| (idx, part.bytes().len()));
 
                 if let Some((part_idx, size)) = maybe_size {
+                    if size == 0 {  // Workaround for a bug where parts are empty. The origin remains unknown.
+                        return Ok(MutationResult::Skipped);
+                    }
                     let target = state.rand_mut().below(size);
                     let range = rand_range(state, other_size, min(other_size, size - target));