diff --git a/NEWS.md b/NEWS.md
index 680826761..2d35ca8a7 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -43,6 +43,8 @@
   widget.
 * mkvmerge: AV1 parser: fixed mkvmerge crashing after uncaught exceptions due
   to certain data conditions. Found by fuzzying.
+* mkvmerge: IVF reader: fixed mkvmerge crashing with a "division by zero"
+  error due to certain data conditions. Found by fuzzying.
 
 
 # Version 50.0.0 "Awakenings" 2020-09-06
diff --git a/src/input/r_ivf.cpp b/src/input/r_ivf.cpp
index b56e56641..c8666eec1 100644
--- a/src/input/r_ivf.cpp
+++ b/src/input/r_ivf.cpp
@@ -45,13 +45,20 @@ ivf_reader_c::read_headers() {
   m_height         = get_uint16_le(&m_header.height);
   m_frame_rate_num = get_uint32_le(&m_header.frame_rate_num);
   m_frame_rate_den = get_uint32_le(&m_header.frame_rate_den);
+  m_ok             = m_width && m_height && m_frame_rate_num && m_frame_rate_den;
 
   show_demuxer_info();
 }
 
+void
+ivf_reader_c::add_available_track_ids() {
+  if (m_ok)
+    add_available_track_id(0);
+}
+
 void
 ivf_reader_c::create_packetizer(int64_t) {
-  if (!demuxing_requested('v', 0) || (NPTZR() != 0))
+  if (!demuxing_requested('v', 0) || (NPTZR() != 0) || !m_ok)
     return;
 
   if (m_codec.is(codec_c::type_e::V_AV1))
@@ -119,9 +126,12 @@ ivf_reader_c::read(generic_packetizer_c *,
 
 void
 ivf_reader_c::identify() {
+  id_result_container();
+
+  if (!m_ok)
+    return;
+
   auto info = mtx::id::info_c{};
   info.add(mtx::id::pixel_dimensions, fmt::format("{0}x{1}", m_width, m_height));
-
-  id_result_container();
   id_result_track(0, ID_RESULT_TRACK_VIDEO, m_codec.get_name(), info.get());
 }
diff --git a/src/input/r_ivf.h b/src/input/r_ivf.h
index 13609ed73..11af7eb91 100644
--- a/src/input/r_ivf.h
+++ b/src/input/r_ivf.h
@@ -23,9 +23,10 @@
 class ivf_reader_c: public generic_reader_c {
 private:
   ivf::file_header_t m_header;
-  uint16_t m_width, m_height;
-  uint64_t m_frame_rate_num, m_frame_rate_den;
+  uint16_t m_width{}, m_height{};
+  uint64_t m_frame_rate_num{}, m_frame_rate_den{};
   codec_c m_codec;
+  bool m_ok{};
   debugging_option_c m_debug{"ivf_reader"};
 
 public:
@@ -33,6 +34,7 @@ public:
     return mtx::file_type_e::ivf;
   }
 
+  virtual void add_available_track_ids() override;
   virtual void read_headers() override;
   virtual void identify() override;
   virtual void create_packetizer(int64_t id) override;
diff --git a/tests/results.txt b/tests/results.txt
index eb4268112..298ef5a0d 100644
--- a/tests/results.txt
+++ b/tests/results.txt
@@ -555,4 +555,4 @@ T_706bcp47_mkvmerge_tracks_disable_language_ietf:d3debb1ac7a98668c4cac753891185b
 T_707bcp47_mkvmerge_chapters_disable_language_ietf:2a2202254f1e426484151e9299f83841-ok-b6807e13a6ea9a2cc609e86b3e9af87d-ok-b6807e13a6ea9a2cc609e86b3e9af87d-ok-b34723deaedf0499e3867766749863b2-ok-b34723deaedf0499e3867766749863b2-ok-b34723deaedf0499e3867766749863b2-ok-ff2908a5f9aedaca69790c4ec909a829-ok-fcf93dcc200afe462b71d16d7c9fef90-ok-fcf93dcc200afe462b71d16d7c9fef90-ok:passed:20200829-101752:0.197644079
 T_708bcp47_propedit_language_ietf_disable_language_ietf:d80d696e8045ebf157d31db09142307c-und+und+ok+ger+und+ok+ger+pt_BR+ok+spa+pt_BR+ok+eng+pt_BR+ok+eng++ok:passed:20200829-103838:0.0
 T_709bcp47_mkvmerge_tags:9208217d36fa9368be5a44b239286424:passed:20200903-234135:0.0
-T_710fuzzying:ok-ok-ok-ok-ok-ok-ok-ok:passed:20200921-133156:0.059249045
+T_710fuzzying:ok-ok-ok-ok-ok-ok-ok-ok-ok:passed:20200921-133156:0.059249045