How to build a map from a recording with gmapping

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I followed this tutorial with the rosbag provided in the tutorial.

Here is the map it produces:

It looks like it only mapped the first scan.

Here is the output from the gmapping node:

rosrun gmapping slam_gmapping scan:=base_scan

[ INFO] [1551524238.823445558, 124.693134426]: Laser is mounted upwards.
 -maxUrange 29.99 -maxUrange 29.99 -sigma     0.05 -kernelSize 1 -lstep 0.05 -lobsGain 3 -astep 0.05
 -srr 0.1 -srt 0.2 -str 0.1 -stt 0.2
 -linearUpdate 1 -angularUpdate 0.5 -resampleThreshold 0.5
 -xmin -100 -xmax 100 -ymin -100 -ymax 100 -delta 0.05 -particles 30
[ INFO] [1551524238.836756704, 124.703192634]: Initialization complete
update frame 0
update ld=0 ad=0
Laser Pose= -19.396 -8.33452 -1.67552
m_count 0
Registering First Scan
[ WARN] [1551524238.863916087, 124.733375778]: Detected jump back in time of 0.00925415s. Clearing TF buffer.
[ WARN] [1551524239.771986838, 125.640838491]: Detected jump back in time of 0.00961792s. Clearing TF buffer.

The warning from the last line repeats. What am I doing wrong here?

Is it possible to use gmapping with a rosbag that contains just the laser scan and no transform?

I use Ubuntu 16.04 and ROS kinetic 1.12.14.