diff --git a/docs/v0.1.0/.documenter-siteinfo.json b/docs/v0.1.0/.documenter-siteinfo.json
index 56348cd..8061f40 100644
--- a/docs/v0.1.0/.documenter-siteinfo.json
+++ b/docs/v0.1.0/.documenter-siteinfo.json
@@ -1 +1 @@
-{"documenter":{"julia_version":"1.10.0","generation_timestamp":"2024-05-02T16:35:27","documenter_version":"1.4.0"}}
\ No newline at end of file
+{"documenter":{"julia_version":"1.10.0","generation_timestamp":"2024-05-13T15:00:01","documenter_version":"1.4.0"}}
\ No newline at end of file
diff --git a/src/formats.jl b/src/formats.jl
index 1803100..e031975 100644
--- a/src/formats.jl
+++ b/src/formats.jl
@@ -1009,15 +1009,17 @@ end
 # For avoiding callbacks when calling Julia from another language.
 function begin_write_lock(action::Function, format::FormatReader)::Any
     thread_id = threadid()
-    @assert format.internal.writer_thread[1] != thread_id
-
-    lock(format.internal.lock)
-    try
-        format.internal.writer_thread[1] = thread_id
-        return action()
-    catch
-        end_write_lock(format)
-        rethrow()
+    if format.internal.writer_thread[1] == thread_id
+        return action()  # untested
+    else
+        lock(format.internal.lock)
+        try
+            format.internal.writer_thread[1] = thread_id
+            return action()
+        catch
+            end_write_lock(format)
+            rethrow()
+        end
     end
 end
 
diff --git a/src/writers.jl b/src/writers.jl
index d39661a..52344ce 100644
--- a/src/writers.jl
+++ b/src/writers.jl
@@ -214,6 +214,7 @@ function delete_axis!(daf::DafWriter, axis::AbstractString; must_exist::Bool = t
         Formats.invalidate_cached!(daf, Formats.axis_names_cache_key())
         Formats.format_increment_version_counter(daf, axis)
         Formats.format_delete_axis!(daf, axis)
+        delete!(daf.internal.axes, axis)
 
         return nothing
     end