hector_mapping: base_link -> laser transform times out once

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Hi,

I'm setting up a hector_mapping node. My simple launch file sets up a static base_link -> laser transform:

<node pkg="hector_mapping" type="hector_mapping" name="hector_mapping" output="screen">

    <param name="pub_map_odom_transform" value="true"/>
    <param name="map_frame" value="map" />
    <param name="base_frame" value="base_link" />
    <param name="odom_frame" value="base_link" />

</node>

<node pkg="tf" type="static_transform_publisher" name="base_to_laser_broadcaster" args="0 0 0 0 0 0 /base_link /laser 100" />

When I run it, I get the following error, but only once:

lookupTransform base_link to laser timed out. Could not transform laser scan into base_frame.

Does that mean there is one lookupTransform call for which the tf wasn't set up, but then it found it?

Thanks in advance,

Ernest