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-rw-r--r--src/epy_reader/reader.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/epy_reader/reader.py b/src/epy_reader/reader.py
index 60feed6..ee615f8 100644
--- a/src/epy_reader/reader.py
+++ b/src/epy_reader/reader.py
@@ -1,3 +1,4 @@
+import copy
import curses
import dataclasses
import multiprocessing
@@ -146,7 +147,7 @@ class Reader:
self._process_counting_letter = multiprocessing.Process(
name="epy-subprocess-counting-letters",
target=count_letters_parallel,
- args=(self.ebook, self._proc_child),
+ args=(copy.deepcopy(self.ebook), self._proc_child),
)
# forking will raise
# zlib.error: Error -3 while decompressing data: invalid distance too far back