Nominatim geocoder - Error: Bad parameter 'viewbox'. Not a box.

[pathmapper]

What is the bug or the crash?

For certain settings, the Nominatim geocoder creates a request with bad paramter viewbox=inf,inf,inf,inf which results in an error message.

https://nominatim.qgis.org/search?format=json&addressdetails=1&viewbox=inf,inf,inf,inf&q=berlin

{"error":{"code":400,"message":"Bad parameter 'viewbox'. Not a box."}}

Steps to reproduce the issue

1. Use the following settings for Nominatim Geocoder
   
2. Open new/blank project and set project CRS to EPSG:25832
3. Add default OSM XYZ layer
4. Rightclick on the layer in layer widget -> Zoom to layer(s)
5. Type Berlin in the locator input
6. A request with bad viewbox parameter is created, no geocoding result is displayed

Versions

QGIS version	3.29.0-Master	QGIS code revision	5fc94c3
Qt version	5.15.3
Python version	3.10.6
GDAL/OGR version	3.4.1
PROJ version	8.2.1
EPSG Registry database version	v10.041 (2021-12-03)
GEOS version	3.10.2-CAPI-1.16.0
SQLite version	3.37.2
PostgreSQL client version	unknown
SpatiaLite version	5.0.1
QWT version	6.1.4
QScintilla2 version	2.11.6
OS version	Ubuntu 22.04.1 LTS
Active Python plugins
sagaprovider	2.12.99
grassprovider	2.12.99
MetaSearch	0.3.6
processing	2.12.99
db_manager	0.1.20

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

No response