diff --git a/docs/changelog.rst b/docs/changelog.rst
index 285d9fc..59f33db 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -1,6 +1,11 @@
 Changelog
 =========
 
+Version 1.2.1 (2023-10-17)
+--------------------------
+
+- Fixed STRFinder GC collection error
+
 Version 1.2.0 (2023-10-15)
 --------------------------
 - Fixed repeat search start position
diff --git a/src/itr.c b/src/itr.c
index b70d1ba..bbf74bc 100644
--- a/src/itr.c
+++ b/src/itr.c
@@ -343,12 +343,7 @@ static PyObject* pytrf_itrfinder_new(PyTypeObject *type, PyObject *args, PyObjec
 	return (PyObject *)obj;
 }
 
-void pytrf_itrfinder_dealloc(pytrf_ITRFinder *self) {
-	Py_DECREF(self->seqname);
-	Py_DECREF(self->seqobj);
-
-	self->seq = NULL;
-
+static void pytrf_itrfinder_dealloc(pytrf_ITRFinder *self) {
 	if (self->motif) {
 		free(self->motif);
 	}
@@ -361,6 +356,11 @@ void pytrf_itrfinder_dealloc(pytrf_ITRFinder *self) {
 		free(self->boundary);
 	}
 
+	self->seq = NULL;
+
+	Py_DECREF(self->seqname);
+	Py_DECREF(self->seqobj);
+
 	Py_TYPE(self)->tp_free((PyObject *)self);
 }
 
diff --git a/src/str.c b/src/str.c
index eb02484..b200104 100644
--- a/src/str.c
+++ b/src/str.c
@@ -47,13 +47,11 @@ static PyObject* pytrf_strfinder_new(PyTypeObject *type, PyObject *args, PyObjec
 }
 
 static void pytrf_strfinder_dealloc(pytrf_STRFinder *self) {
-	if (self->boundary) {
-		free(self->boundary);
-	}
+	self->seq = NULL;
 
 	Py_DECREF(self->seqname);
 	Py_DECREF(self->seqobj);
-	self->seq = NULL;
+
 	Py_TYPE(self)->tp_free((PyObject *)self);
 }
 
@@ -133,7 +131,7 @@ static PyObject* pytrf_strfinder_as_list(pytrf_STRFinder *self) {
 
 	//ssr length
 	int sl;
-	
+
 	char motif[7];
 
 	Py_ssize_t i;
diff --git a/src/version.h b/src/version.h
index 7345915..119b975 100644
--- a/src/version.h
+++ b/src/version.h
@@ -1 +1 @@
-#define PYTRF_VERSION "1.2.0"
+#define PYTRF_VERSION "1.2.1"