Bibisected using the bibisect-linux-64-6.2 repo:

f90a939720a29fdaf65fef6ef2e05cb96021d87e is the first bad commit
commit f90a939720a29fdaf65fef6ef2e05cb96021d87e
Author: Jenkins Build User <email address hidden>
Date:   Tue Nov 13 08:24:06 2018 +0100

    source sha:ca0308797df86ebece19260f3ca438a0cb437208

author Stephan Bergmann <email address hidden>	2018-11-13 08:13:00 +0100
committer Stephan Bergmann <email address hidden>	2018-11-13 08:13:00 +0100
commit	ca0308797df86ebece19260f3ca438a0cb437208 (patch)
tdf#121337: Fail on GIO error in GIO UCP getPropertyValue

CCing Stephan Bergmann. Would you please take a look?



$ git bisect log
# bad: [8b2cf76950e32ea46ff293ce75177841ad920e38] source sha:1149d20ce9f8682b58f98d3fa3bf289fc5974087
# good: [f741463dfe1900d3acf87b538c0c043e42bc523d] source sha:3a801799536e6870f2fb111b1cc00b9575a35a39
git bisect start 'master' 'oldest'
# good: [f2a6a57cb2d0fbe45c9cfafdcf33a816c6ced63f] source sha:da8617d69a7b27a3eeb3f26e207ddf1b4de3eeb3
git bisect good f2a6a57cb2d0fbe45c9cfafdcf33a816c6ced63f
# good: [6ed11ecb665d289c0981da1f10c42877a870e5a2] source sha:b44b9c4519794d159b154a9713c10da1155a5198
git bisect good 6ed11ecb665d289c0981da1f10c42877a870e5a2
# bad: [b86f40dd1acc3d1baa3ffb3c15ac9f07eb53da66] source sha:f918e71d4e615fcc4527051a6e7f6bb4768d1269
git bisect bad b86f40dd1acc3d1baa3ffb3c15ac9f07eb53da66
# good: [a28cd13932f62645e77d63bd3309786c1e8c3cfc] source sha:52b5955100fdb5898110429814d5369275267a17
git bisect good a28cd13932f62645e77d63bd3309786c1e8c3cfc
# bad: [5d6d1ddefa763ebfca9e0a2522f33a8b1f28510f] source sha:698942ac73b8502eb1957b70dd165023e8d54c82
git bisect bad 5d6d1ddefa763ebfca9e0a2522f33a8b1f28510f
# good: [b27639cc47860e71920363a6720758e33243faaa] source sha:4d39ec07808276d7dbd2f92a08524f82ab5d715f
git bisect good b27639cc47860e71920363a6720758e33243faaa
# good: [095d4698cb1afdc4cea5038e18321f4798ab7c2f] source sha:b7d0b49f5708b55e24aabb719e26ce5ec8628161
git bisect good 095d4698cb1afdc4cea5038e18321f4798ab7c2f
# bad: [07065b7a0643f3fbd3e65bc879024c6c0ccba07f] source sha:b389aafee9cfba9dc4dfa552347be39ff9fe41b2
git bisect bad 07065b7a0643f3fbd3e65bc879024c6c0ccba07f
# bad: [727c2e08240b2ab0883d2d17bdd34e557c54b326] source sha:3460e91ac853964015215ec75be7cf63361ca0e9
git bisect bad 727c2e08240b2ab0883d2d17bdd34e557c54b326
# bad: [34ecd55e5ef85387279ddc20cbcc995b730d025f] source sha:f6b3b696ad9d454f7acbe930439cccc052e9fce2
git bisect bad 34ecd55e5ef85387279ddc20cbcc995b730d025f
# bad: [d3c8643f5a98e67791fa77e3e7ec072d33269b1d] source sha:3583f7a1256c901199574c8373443038e28813f0
git bisect bad d3c8643f5a98e67791fa77e3e7ec072d33269b1d
# bad: [ee785994dd46546781fa1123280dbc363dc3dcd5] source sha:630b5db9a10cd49d24d5e563374bd68f1fe670f5
git bisect bad ee785994dd46546781fa1123280dbc363dc3dcd5
# bad: [f90a939720a29fdaf65fef6ef2e05cb96021d87e] source sha:ca0308797df86ebece19260f3ca438a0cb437208
git bisect bad f90a939720a29fdaf65fef6ef2e05cb96021d87e
# first bad commit: [f90a939720a29fdaf65fef6ef2e05cb96021d87e] source sha:ca0308797df86ebece19260f3ca438a0cb437208

---

Note: It gives the following warning even if in good versions when the file is successfully saved, so this warning is possibly not related to this bug:

(soffice:18295): GLib-CRITICAL **: 18:38:15.953: g_file_test: assertion 'filename != NULL' failed