ERROR (internal_error): Operation on mixed SRID geometries

I got this issue when I tried to optimize a pgsql code with postgis.
See the following example that works with if you join it with other sentence:

SELECT ST_SetSRID(ST_MakeLine(ST_MakePoint(4.51, 52.2), ST_MakePoint(23.42, 37.58)),4326)

But, if you only replace ST_MakePoint by a geom selection you will have an error:

 SELECT ST_SetSRID(ST_MakeLine( (select point from nodes where name='3'), (select point from nodes where name='20')) ,4326)

 ERROR: Operation on mixed SRID geometries SQL state: XX000

To solve it just delete ST_SetSRID as follows:

SELECT ST_MakeLine( (select point from nodes where name='3'), (select point from nodes where name='20'))

Now it works
Enjoy it!

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