JavaScript warning on frontend

On frontend a JavaScript warning is logged per maps block:

`
js?v=3.exp&language=de&key=[...]:67 InvalidValueError: setIcon: not a string; and not an instance of PinView; and no url property; and no path property
_.fe @ js?v=3.exp&language=de&key=[...]:67
_.ie @ js?v=3.exp&language=de&key=[...]:68
(anonymous) @ js?v=3.exp&language=de&key=[...]:90
_.M.setValues @ js?v=3.exp&language=de&key=[...]:214
sg @ js?v=3.exp&language=de&key=[...]:95
_.Ug @ js?v=3.exp&language=de&key=[...]:101
j.createMarker @ gmaps.min.js?ver=0.4.25:1
j.addMarker @ gmaps.min.js?ver=0.4.25:1
(anonymous) @ script.min.js?ver=5.7:12
(anonymous) @ script.min.js?ver=5.7:12
h @ script.min.js?ver=5.7:12
u.onload.u.onerror.u.<computed> @ script.min.js?ver=5.7:12
load (async)
v @ script.min.js?ver=5.7:12
e @ script.min.js?ver=5.7:12
(anonymous) @ script.min.js?ver=5.7:12
d @ script.min.js?ver=5.7:12
p @ script.min.js?ver=5.7:12
(anonymous) @ script.min.js?ver=5.7:12
setTimeout (async)
g @ script.min.js?ver=5.7:12
(anonymous) @ script.min.js?ver=5.7:12
h @ script.min.js?ver=5.7:12
u.onload.u.onerror.u.<computed> @ script.min.js?ver=5.7:12
load (async)
v @ script.min.js?ver=5.7:12
e @ script.min.js?ver=5.7:12
(anonymous) @ script.min.js?ver=5.7:12
d @ script.min.js?ver=5.7:12
p @ script.min.js?ver=5.7:12
(anonymous) @ script.min.js?ver=5.7:12
setTimeout (async)
g @ script.min.js?ver=5.7:12
(anonymous) @ script.min.js?ver=5.7:12
each @ jquery.js?ver=3.5.1:381
each @ jquery.js?ver=3.5.1:203
value @ script.min.js?ver=5.7:12
value @ script.min.js?ver=5.7:12
(anonymous) @ script.min.js?ver=5.7:12
requestAnimationFrame (async)
(anonymous) @ script.min.js?ver=5.7:12
f @ script.min.js?ver=5.7:12
u @ script.min.js?ver=5.7:12
js?v=3.exp&language=de&key=[...]:67 InvalidValueError: setIcon: not a string; and not an instance of PinView; and no url property; and no path property


`

The map blocks still appear to work properly, but the warning indicates that a variable is not checked in the block script.