singleton object must not be null

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
singleton object must not be null	0.55	0.5	254	49	33
singleton	0.31	0.5	2564	60	9
object	0.48	0.3	418	25	6
must	0.42	0.5	3128	21	4
not	1.83	0.7	2211	3	3
be	1.37	0.6	1508	4	2
null	0.56	0.4	8115	93	4

Keyword	CPC	PCC	Volume	Score
singleton object must not be null	1.62	0.1	3196	59
is null set a singleton set	1.86	0.4	5294	74
object must not be null	1.62	1	9592	8
model object must not be null	0.19	0.5	2527	25
what is a singleton object	0.41	0.7	8766	88
list must not be null	1.71	0.9	4884	91
singleton object in javascript	1.46	0.2	2400	73
object is set to null	0.59	1	8058	10
a set can contain one null value	1.49	0.7	7076	13
what is a null set	1.49	0.1	538	29
is the null set in every set	0.37	0.4	8393	73
what is a null set in math	0.64	0.3	9073	22
null set is denoted by	1.58	0.3	3726	2
null set or empty set	0.9	1	1230	33
null values in set	0.64	0.2	9739	37
does set allows null values	1.5	0.8	6712	11
sql set not null	1.3	0.4	9582	17
on delete set null	1.62	0.4	1488	19
null set definition math	0.76	0.9	8421	43
model is not null here	1.03	0.7	4160	50
source object must not be null	1.67	1	1277	6
target object must not be null	0.3	1	1929	88
candidate object must not be null	1	0.7	6968	21
model object names must be non-empty	0.4	0.9	2992	66
module must not be null	1.9	0.1	6879	94
class must not be null	1.15	0.5	1051	15
value must not be null	0.97	0.4	8607	70
method must not be null	1.82	0.1	500	51
subject must not be null	0.49	1	8855	1
null is not object	0.42	0.9	4877	83
what is a null model	0.01	0.5	9533	52
null object is not allowed	0.2	0.4	1270	25
model object has no attribute	0.55	0.1	5708	25
modelandview model is null	0.46	0.6	3150	18
object require non null java	1.83	0.4	950	9