Electric current has both magnitude and direction. But it is a scalar. If it is assumed as vector quantity, then :

current doesnot obey laws of vector addition. As current is a scalar quantity the law of conservation of charge holds good

$According to vector addition, if current is a vector i=\sqrt{{i^2}_1+{i^2}_1+2i_1{i}_2\cos \theta }$

$As \cos \theta lies between -1 and +1$

$i_1-i_2\le i\le i_1+i_2$

$Q_1-Q_2\le Q\le Q_1+Q_2$

$from above equation charge is not conserved as current entering junction is not equal to current leaving the junction$